Free Dev Tools & Product Management Insights

Free Dev Tools & Product Management Insights | Minal Goel

242 free client-side developer tools plus product management frameworks and insights. No uploads. No accounts. 100% offline.

Free Online Tools

Developer Tools

JSON Formatter & Validator — Format, validate, and minify JSON. Shows exact line and column of parse errors.
Base64 Encoder / Decoder — Encode text or files to Base64, or decode Base64 back to text. Auto-detects mode.
Hex / Text Encoder & Decoder — Convert text to hexadecimal bytes or decode hex back to readable text. UTF-8 aware — handles emoji and multibyte characters.
JWT Decoder — Inspect JWT header, payload, expiry, and claims. Decode-only — never verifies signatures.
Unix Timestamp Converter — Convert timestamps to dates in any timezone, or dates back to Unix timestamps. Live clock included.
Regex Tester — Test regular expressions with inline match highlighting, capture groups, and named captures.
URL Encoder / Decoder — Encode or decode URL strings. Parses full URLs into protocol, host, path, and query params.
UUID Generator — Generate up to 100 cryptographically random UUID v4 values using the browser's CSPRNG.
Number Base Converter — Convert numbers between binary, octal, decimal, and hexadecimal — all four bases at once.
HTML Entity Encoder / Decoder — Encode text to HTML entities or decode them back. Covers all HTML5 named references.
MD5 Generator — Generate MD5 hashes from text or files. For legacy systems only — not for security use.
SHA-256 / SHA-512 Generator — Hash text or files with SHA-256 and SHA-512. Both digests shown side by side.
Cron Expression Parser — Translate cron expressions to plain English and preview the next 5 scheduled run times.
CSV to JSON — Convert CSV files or pasted data to JSON. Auto-detects types, shows a preview table.
JSON to CSV — Convert JSON arrays to CSV. Flattens nested objects with dot-notation keys.
Markdown to HTML — Convert Markdown to sanitized HTML with a live sandboxed preview. XSS-safe via DOMPurify.
XML Formatter & Validator — Format, validate, and minify XML. Preserves namespaces, CDATA, and processing instructions. Shows exact error positions.
ROT13 / Caesar Cipher — Shift letters by N positions in the alphabet. ROT13 is symmetric — encode and decode with the same function.
Morse Code Translator — Convert text ↔ Morse code (dots and dashes). ITU standard with auto-detect direction.
JSON Diff Comparator — Compare two JSON documents structurally. Shows text diff + structural changes (added/removed/changed keys).
JSON Schema Generator — Generate a JSON Schema (draft-07) from any sample JSON value. Infers types for all JSON data types.
JSON Tree Viewer — Explore JSON as an interactive tree. Expand/collapse nodes, see types highlighted, and click values to copy.
HMAC Generator — Compute HMAC-SHA256 and HMAC-SHA512 message authentication codes. Both digests shown simultaneously.
AES Encrypt / Decrypt — Encrypt and decrypt text with AES-256-GCM via the browser's Web Crypto API. Passphrase-based, zero server contact.
YAML Formatter & Validator — Format and validate YAML with consistent indentation. Uses js-yaml v4 safe load — no code execution.
CSS Box-Shadow Generator — Build CSS box-shadow values visually with a live preview. Up to 5 layers, color, blur, spread, and inset support.
UTF-8 Byte Inspector — See the Unicode code point and UTF-8 hex bytes for every character. Handles emoji, accented letters, and all Unicode.
PBKDF2 Key Derivation — Derive a cryptographic key from a password using PBKDF2. Configurable iterations, key length, and hash algorithm.
HTTP Status Code Reference — Quick reference for all HTTP status codes. Search by code, name, or keyword. Includes RFC references.
Bcrypt Hash & Verify — Generate bcrypt password hashes or verify a password against a hash. Configurable cost rounds 4–16.
TOML ↔ JSON Converter — Convert TOML to JSON or JSON to TOML. Auto-detects direction. Uses smol-toml for fast, spec-compliant parsing.
INI ↔ JSON Converter — Convert INI config files to JSON or JSON to INI format. Handles sections, key=value pairs, and comments.
Cookie Header Parser — Parse HTTP Cookie header strings into name/value pairs. Decodes URL-encoded values and exports as JSON.
User-Agent Parser — Parse any user-agent string into browser, OS, device type, and engine. Includes your current browser's UA.
HTML Formatter & Beautifier — Beautify and format HTML markup with consistent indentation. Powered by js-beautify — the same formatter used by VS Code.
.gitignore Generator — Generate .gitignore files from 14 templates: Node.js, Python, Go, Rust, React, macOS, Windows, VS Code, and more.
CSS Border-Radius Generator — Generate CSS border-radius values with a live preview. Control each corner individually or all at once.
Meta Tag Generator — Generate complete HTML meta tags for SEO, Open Graph, and Twitter Card. Live preview with character count guidance.
robots.txt Generator — Generate robots.txt files with User-agent rules, Allow/Disallow paths, Sitemap reference, and crawl delay.
Luhn Algorithm Validator — Validate credit card numbers with the Luhn algorithm. Detects card type and shows built-in test card numbers.
Markdown Editor — Full-screen Markdown editor with live preview. Split, editor-only, and preview-only modes. Download as .md or .html.
Unicode Normalizer — Normalize text to NFC, NFD, NFKC, or NFKD form. Shows code point and byte counts before/after normalization.
SQL Formatter & Beautifier — Format and beautify SQL queries. Supports MySQL, PostgreSQL, SQLite, BigQuery, and T-SQL. Keyword case control.
DOCX to HTML / Markdown — Convert Word .docx files to clean HTML or Markdown. Preserves headings, lists, bold, italic, and tables.
Excel to CSV Converter — Convert Excel .xlsx workbooks to CSV. Handles multiple sheets — download each sheet as a separate CSV.
CIDR / Subnet Calculator — Calculate subnet details from CIDR notation. Network address, broadcast, host range, mask, and host count.
OpenAPI / Swagger Validator — Validate OpenAPI 3.x and Swagger 2.x specifications. Checks required fields, path structure, and operations.
GraphQL Formatter — Format and validate GraphQL queries, mutations, and schemas. Uses the official graphql-js parser.
cURL to Fetch Converter — Convert cURL commands to JavaScript fetch() calls, or fetch() back to cURL. Handles headers, methods, and bodies.
HTTP Header Inspector — Parse HTTP headers and see descriptions for Content-Type, CSP, CORS, Cache-Control, Auth, and more.
Punycode / IDN Converter — Convert internationalized domain names between Unicode and Punycode (xn--) ACE format using the native URL API.
CSV Diff Comparator — Compare two CSV files and show row-level differences. Normalizes formatting before comparison.
TSV ↔ CSV Converter — Convert between TSV (tab-separated values) and CSV (comma-separated values). Auto-detects format from input.
JMESPath Tester — Test JMESPath expressions against JSON. Filter, sort, project, and transform JSON data interactively.
Mermaid Diagram Renderer — Render Mermaid diagrams from text. Flowcharts, sequence diagrams, class diagrams, Git graphs, pie charts.
JSON to TypeScript — Generate TypeScript interfaces or type aliases from JSON. Handles nested objects, arrays, and optional fields.
HTML Minifier — Minify HTML by removing comments, collapsing whitespace, and removing empty attributes. Shows size savings.
Unicode Character Lookup — Inspect every character in a string: code point, UTF-8 bytes, HTML entity, and Unicode category.
Markdown to PDF — Convert Markdown to a clean PDF via browser print dialog. Live preview, 3 templates, XSS-safe rendering.
Binary ↔ Text Converter — Convert text to binary (0s and 1s) or decode binary back to text. Each character is represented as an 8-bit binary number.
ASCII ↔ Text Converter — Convert text to ASCII decimal codes or decode ASCII numbers back to text. Shows decimal code for each character.
Caesar Cipher — Encrypt or decrypt text with the Caesar cipher. Shift letters by any value 0–25. ROT13 is shift 13.
Vigenère Cipher — Encrypt or decrypt text with the Vigenère cipher using a keyword. A polyalphabetic substitution cipher stronger than Caesar.
Quoted-Printable Encoder — Encode text to Quoted-Printable format (used in email) or decode QP back to plain text. Non-ASCII characters are encoded as =XX.
MIME Header Decoder — Decode RFC 2047 MIME-encoded email headers. Supports Base64 (B encoding) and Quoted-Printable (Q encoding).
CSS Clip-Path Generator — Generate CSS clip-path shapes visually — circle, ellipse, polygon, and inset. Copy the CSS code instantly.
CSS Triangle Generator — Generate CSS triangles using the border trick. Choose direction, size, and color — copy the CSS.
MIME Type Lookup — Look up MIME types by file extension, or find extensions for a MIME type. Includes 80+ common types.
.htaccess Generator — Generate Apache .htaccess rules for HTTPS redirect, www redirect, gzip, browser caching, and more.
OG Image Generator — Generate Open Graph preview images (1200×630) for social media. Customize title, colors, fonts, and background.
XML to JSON Converter — Convert XML to JSON. Handles attributes, nested elements, and arrays. Runs in the browser.
JSON to XML Converter — Convert JSON to XML. Handles nested objects, arrays, and attributes. Runs in the browser.
JSONPath Tester — Test JSONPath expressions against JSON data. Supports $, .key, [n], [*], and .* selectors.
TSV ↔ JSON Converter — Convert between TSV (tab-separated values) and JSON array format. First row is treated as headers.
CSV Viewer — View CSV data as a formatted table. Paste CSV text or upload a .csv file. Shows up to 100 rows.
Emoji & Unicode Lookup — Analyze text character by character — see Unicode code points, hex values, HTML entities, CSS escapes, and byte counts.
Properties ↔ YAML Converter — Convert Java .properties files to YAML or JSON. Handles dot-notation keys as nested objects.
Markdown Table Generator — Build Markdown tables visually. Add rows and columns, set alignment, and copy the formatted Markdown.
HTML Table Generator — Generate HTML tables visually. Add rows, columns, and styles. Copy ready-to-use HTML.
CSS Grid Generator — Generate CSS Grid layouts visually. Set columns, rows, gaps, and templates. Preview live.
CSS Flexbox Generator — Generate CSS Flexbox properties visually with a live preview. Copy ready-to-use CSS.
REST API Mock Builder — Design REST API mock endpoints. Set method, path, status code, and response body. Generate curl and fetch code.
CSS Keyframes Generator — Generate CSS @keyframes animations. Set start/end states, duration, timing function, and more.
JWT Signer — Sign JSON Web Tokens (JWT) with HMAC-SHA256/384/512. Define payload, set secret, and generate tokens.
Prettier Code Formatter — Format JavaScript, TypeScript, CSS, HTML, JSON, and Markdown with Prettier.
Argon2 Password Hasher — Hash passwords with Argon2id, Argon2i, or Argon2d in your browser.
OpenPGP Encrypt — Encrypt messages with OpenPGP public-key or passphrase encryption.
OpenPGP Decrypt — Decrypt OpenPGP messages using your private key or passphrase.
OpenPGP Key Generator — Generate PGP key pairs (public + private) for OpenPGP encryption.
Tesseract OCR — Extract text from images using Tesseract OCR — supports 10 languages.

Text Tools

Word & Character Counter — Live stats: words, characters, sentences, paragraphs, reading time, and top keyword frequency.
Case Converter — Convert text to UPPERCASE, lowercase, Title Case, camelCase, snake_case, kebab-case, and more — all at once.
Whitespace & Line Cleaner — Trim lines, remove blank lines, deduplicate, sort, reverse, or collapse extra spaces — combinable operations.
Text Reverser & Flipper — Reverse characters, words, or lines. Flip text upside-down with Unicode characters.
Slug / Handle Generator — Convert any text to URL slug, snake_case, dot.notation, or CONSTANT_CASE with length control.
String Hash Generator — Generate MD5, SHA-1, SHA-256, and SHA-512 hashes simultaneously. Security notes included.
HTML Stripper — Extract plain text from HTML. Uses DOMParser — no script execution, nothing injected into the page.
Lorem Ipsum Generator — Generate placeholder words, sentences, or paragraphs. Optional HTML <p> tags and Lorem ipsum prefix.
Text Diff Checker — Compare two texts with inline additions (green) and deletions (red). Line-by-line or word-by-word mode.
Sort Lines — Sort lines A→Z, Z→A, by length, numerically, or shuffle. Remove duplicates, trim, and ignore leading numbers.
Word Frequency Counter — Analyze how often each word appears in text. Filter stop words, set minimum length, and export the frequency table as CSV.
Number to Words — Convert numbers up to 999 trillion into English words, ordinal form, or currency notation.
Add Prefix / Suffix to Lines — Add a prefix and/or suffix to every line in a text block. Useful for SQL quoting, HTML wrapping, and bulk commenting.
Number Lines — Add sequential line numbers to text, or strip existing line numbers. Custom start number, separator, and zero-padding.
Find & Replace — Find and replace text with optional regex. Case-sensitive, whole-word, and replace-all or first-only modes.
ASCII Art Generator — Convert text to block-letter ASCII art. Pure JavaScript — no library. Copy or download as .txt.
Text & Sentence Statistics — Advanced text analysis: sentence count, reading time, Flesch score, lexical density, syllables, and most frequent word.
Wrap / Unwrap Text — Wrap text at a specified column width (40–200) or unwrap line-wrapped text back into paragraphs.
Smart Quote & Typography Fixer — Convert straight quotes to curly smart quotes, or revert smart quotes to straight. Also fixes em/en dashes and ellipsis.
Deduplicate Lines — Remove duplicate lines from text. Options for case sensitivity, whitespace trimming, and sort order.
Strip Line Numbers — Remove leading line numbers from numbered text. Handles formats like '1.', '1)', '1:', or plain '1 '.
Random Line Picker — Pick one or more random lines from a list. Perfect for choosing random items, winners, or samples.
Dash Fixer — Replace hyphens with typographically correct em dashes (—) or en dashes (–). Auto-detects context.
Strip Diacritics / Accents — Remove accents and diacritical marks from text. Converts é→e, ñ→n, ü→u, ç→c and more.
Indent / Dedent Text — Add or remove indentation from text. Choose spaces or tabs, set indent amount.
Zero-Width Character Detector — Detect and remove invisible zero-width characters hidden in text. Finds ZWS, ZWJ, BOM, and directional marks.
Unicode Confusables Detector — Detect Unicode homoglyphs — characters that look identical to ASCII but are different code points. Used in phishing and spoofing attacks.
Emoji Search — Search and copy emojis by name or keyword. Click any emoji to copy it to your clipboard.

Numbers & Dates Tools

Percentage Calculator — Three modes: X is what % of Y, what is X% of Y, and % change between two values. Formula shown.
Age Calculator — Precise age in years/months/days, total days lived, days until next birthday, day of week born.
Date Difference Calculator — Time between two dates expressed in years, months, weeks, days, hours, and minutes simultaneously.
Roman Numeral Converter — Convert integers (1–3,999) to Roman numerals and back. Auto-detects direction, validates input.
BMI Calculator — Calculate BMI in metric or imperial. Shows WHO category and healthy weight range for your height.
Tip Calculator — Split any bill with custom tip percentage. Shows tip, total, and per-person amounts with formula.
Temperature Converter — Convert Celsius, Fahrenheit, Kelvin, and Rankine simultaneously. Enter any scale — all others update instantly.
Unit Converter — Convert between units of length, weight, area, volume, speed, and data size. All equivalents shown simultaneously.
Countdown Timer — Set a countdown by hours, minutes, and seconds. Start, pause, and reset. Presets for 5 min, 25 min (Pomodoro), and 1 hour.
Random Number Generator — Generate random integers in any range. No duplicates and sort options. Cryptographically secure via crypto.getRandomValues().
Compound Interest Calculator — Calculate compound interest with optional periodic contributions. Shows year-by-year balance, interest earned, and total contributions.
Loan Calculator — Calculate monthly payment, total interest, and full amortization schedule for any loan.
GST / VAT Calculator — Add GST/VAT to a price or extract tax from a gross amount. Shows net, tax, and gross. Preset rates 5%–28%.
Discount Calculator — Calculate sale price from % or fixed discount. Shows savings amount and effective discount percentage.
World Clock — Live clocks for 35+ cities across all timezones. Add or remove cities and see times update in real time.
Calorie & TDEE Calculator — Estimate daily calorie needs using Mifflin-St Jeor. Shows BMR, TDEE, and macro breakdown for your goal.
Body Fat Calculator — Estimate body fat % using the US Navy method (circumference measurements). Shows lean mass and fitness category.
GPA Calculator — Calculate GPA from letter grades or numeric scores. Supports 4.0, 10.0, and 100-point scales. Add any number of courses.
Fuel Cost Calculator — Calculate fuel cost for any trip. Supports km/miles, L/100km, mpg, km/L, and price per liter or gallon.
Statistics Calculator — Calculate mean, median, mode, standard deviation, variance, quartiles, and IQR from a list of numbers.
Probability & Combinatorics Calculator — Calculate probability, combinations C(n,r), permutations P(n,r), and binomial distribution. Formula shown.
Stopwatch with Lap Times — Precise stopwatch with lap time recording. Shows lap vs average comparison. Keyboard shortcuts: Space, L, R.
Salary Calculator — Convert salary between hourly, daily, weekly, monthly, and annual rates. Configure work hours and days.
Calorie Burn Calculator — Estimate calories burned by activity using MET values. 24 activities from running to yoga. Metric and imperial.
Margin & Markup Calculator — Calculate profit margin and markup from any two of: cost, revenue, margin %, or markup %. Shows all five values.
Scientific Notation Converter — Convert between scientific notation (1.5×10⁸), standard numbers, engineering notation, and English words.
Length Converter — Convert between length units: mm, cm, m, km, inches, feet, yards, and miles.
Area Converter — Convert between area units: m², km², hectares, acres, sq ft, sq in, and more.
Volume Converter — Convert between volume units: litres, gallons, cups, fl oz, m³, and more.
Weight / Mass Converter — Convert between weight units: kg, pounds, ounces, stones, tonnes, and more.
Data Size Converter — Convert between data units: bits, bytes, KB, MB, GB, TB and binary equivalents (KiB, MiB, GiB).
Pomodoro Timer — Pomodoro technique timer with 25-minute focus, 5-minute short breaks, and 15-minute long breaks. Tracks sessions.
Working Days Calculator — Calculate business days between dates, excluding weekends and optional holidays. Also add N working days to a date.
Dice Roller — Roll d4, d6, d8, d10, d12, d20, and d100 dice with modifier support. Cryptographically random. Roll history included.
Number Formatter — Format numbers with currency, percent, compact, scientific, and locale-specific styles. Compare across 6 locales instantly.
Calendar Generator — Generate a printable monthly calendar for any month and year. Navigate months, jump to any year, and print as PDF.
Speed Converter — Convert between speed units: m/s, km/h, mph, knots, ft/s, and Mach.
Pressure Converter — Convert between pressure units: Pa, kPa, bar, atm, psi, mmHg, inHg, and Torr.
Energy Converter — Convert between energy units: Joules, calories, kWh, BTU, eV, and more.
Mortgage Calculator — Calculate monthly mortgage payments, total interest, and see an amortization schedule.
VAT Calculator — Add or remove VAT from a price. Supports any VAT rate with common presets (5%, 10%, 18%, 20%, 25%).
SIP Calculator — Calculate returns on SIP (Systematic Investment Plan) investments. See maturity value, total returns, and yearly growth.
Scientific Calculator — A browser-based scientific calculator with trig functions, logarithms, powers, and constants (π, e).
Meeting Planner — Plan meetings across time zones. Add cities, pick a time, and see what time it is everywhere.

Color Tools

Color Format Converter — Convert any color between HEX, RGB, HSL, HSV, and CMYK. Live swatch preview, nearest CSS name.
Color Contrast Checker — WCAG 2.1 contrast ratio with AA/AAA pass/fail for normal and large text. Live text preview.
Color Palette Generator — Generate complementary, triadic, analogous, monochromatic, and split-complementary palettes from any seed color.
Gradient Generator — Build CSS linear or radial gradients with 2–5 color stops. Live preview and copyable CSS output.
Image Color Picker — Pick exact pixel colors from any image. Click to sample HEX/RGB/HSL. Keeps last 12 picked colors.
Screen Color Picker — Pick any color from your screen using the EyeDropper API. Shows HEX, RGB, HSL. Keeps history of last 12 colors.
CSS Color Name Lookup — Browse all 148 CSS named colors with swatches. Find the nearest CSS color name for any hex value.
Random Color Generator — Generate random color palettes. Pastel, vivid, dark, or monochromatic schemes. Copy as HEX, RGB, or CSS custom properties.
Tailwind Shade Generator — Generate an 11-shade Tailwind CSS color palette from any base color. Export as CSS variables or tailwind.config.js.

Image Tools

Image Resizer — Resize images by dimensions, percentage, or target file size. Lock aspect ratio. Canvas-based, no uploads.
Image Compressor — Compress up to 10 images at once with a quality slider. Shows per-file savings. All local.
Image Cropper — Crop images with a free or fixed-ratio crop tool. Presets: 1:1, 16:9, 4:3, 3:2. Export as PNG/JPEG/WebP.
Image Format Converter — Convert PNG, JPG, WebP, BMP, GIF to PNG, JPEG, or WebP via Canvas. Quality control for JPEG/WebP.
Image to Grayscale — Convert any image to grayscale using the ITU-R luminance formula. Side-by-side before/after preview.
Image Metadata Viewer — View EXIF data from JPEG/PNG/WebP: camera, date, GPS, exposure. GPS privacy warning shown if found.
EXIF Metadata Stripper — Remove all EXIF metadata (GPS, camera, timestamps) from JPEG and PNG images. Canvas re-encode strips everything.
SVG to PNG Converter — Convert SVG code or files to PNG. Choose 1×, 2×, 3×, or 4× scale for retina displays. Canvas-based, no uploads.
Image Rotator & Flipper — Rotate images 90°, 180°, 270°, or flip horizontally/vertically. Export as JPEG, PNG, or WebP.
Placeholder Image Generator — Generate placeholder images at any size with custom colors and text. No network requests — pure canvas.
Image Filters & Effects — Apply brightness, contrast, saturation, sepia, blur, invert, and grayscale filters. Live preview + CSS output.
Image Watermark — Add text watermarks to images. Position, opacity, rotation, color, and tile repeat controls. Canvas-based, no uploads.
Image Dominant Color Extractor — Extract dominant colors from any image using canvas pixel sampling. Shows hex codes, RGB values, and percentages.
Image Flipper — Flip images horizontally, vertically, or both. Fast canvas-based processing in your browser.
Image Color Picker — Click anywhere on an image to pick the exact pixel color. Shows HEX, RGB, HSL, and RGBA values.
AI Background Remover — Remove image backgrounds using AI — runs entirely in your browser.
Image to Base64 — Convert any image to a Base64 data URI. Copy the full data URI or raw Base64 string for use in HTML, CSS, or APIs.
Favicon Generator — Generate favicons from 1-2 letter text. Custom colors, border radius, all 5 standard sizes (16–128px). Download as PNG.
Image Pixel Diff — Compare two images pixel by pixel. Shows changed pixel count, percentage, and a diff image with differences highlighted.
Color Blindness Simulator — Simulate how images appear to people with protanopia, deuteranopia, tritanopia, and achromatopsia.
HEIC to JPG Converter — Convert iPhone HEIC/HEIF photos to JPEG. Browser-based with heic2any — no upload required.
Image Collage Maker — Create 2×2, 3×3, or strip image collages. Upload to fill slots, set gap and background, download as JPEG.
Image to ASCII Art — Convert any image to ASCII art using canvas pixel sampling. Adjustable width, character density, and invert options.
Image Format & Info Checker — Check image format, dimensions, aspect ratio, file size, megapixels, and transparency from any uploaded image.
Coin Flipper — Flip a virtual coin — heads or tails. Flip multiple coins at once and track your flip history.
List Shuffler — Randomly shuffle a list of items. Paste one item per line and get a randomly reordered list.
PIN / OTP Generator — Generate random PINs and one-time passwords. Control length, count, and constraints like no repeated or sequential digits.
Diceware Passphrase Generator — Generate memorable random passphrases using the Diceware method. Combines random words for strong, easy-to-remember passwords.
Test Credit Card Generator — Generate fake credit card numbers that pass the Luhn check. For software testing and form validation only.
Barcode Reader — Scan barcodes from images — Code 128, EAN-13, UPC-A, PDF417, QR codes, and more. Browser-native API.
Bulk Image Renamer — Rename multiple images in bulk. Choose a naming pattern (sequential, prefix, date) and download with new names.
Bulk Image Converter — Convert multiple images to JPEG, PNG, or WebP in one go. Shows file size savings per image.

Security & Crypto Tools

Password Generator — Cryptographically secure passwords via crypto.getRandomValues(). Custom charset, bulk generate, entropy display.
Password Strength Checker — Dropbox's zxcvbn algorithm — pattern matching against dictionaries, not just character classes. Crack time estimates.
Hash Verifier — Compute SHA-256, SHA-512, or MD5 of text or a file, then compare against an expected hash value.
Passphrase Generator — Generate memorable diceware-style passphrases. Multiple words = high entropy + human-memorable. crypto.getRandomValues only.
Random String Generator — Generate random strings with configurable character sets. API keys, tokens, PINs, and test data. crypto.getRandomValues only.

Utility Tools

QR Code Generator — Generate QR codes from any text or URL. Custom size, error correction, and colors. Download as PNG.
HTML to Markdown — Convert HTML to clean Markdown. Paste HTML or upload a .html file. Turndown-powered.
JSON ↔ YAML Converter — Convert between JSON and YAML. Auto-detects direction. Safe YAML load — no code execution.
File Diff Viewer — Compare two text files side-by-side with color-coded line additions, deletions, and a summary.
URL Parser & Builder — Parse a URL into components or build one from parts. Edit query params and see the URL update live.
QR Code & Barcode Reader — Scan QR codes and barcodes from uploaded images using the native BarcodeDetector API. Chrome 88+ required.
Fake Name Generator — Generate realistic fake names, emails, addresses, and more for testing. Choose count and gender.

PDF Tools

PDF Merger — Combine up to 20 PDFs into one. Reorder files before merging. Runs entirely in your browser.
PDF Splitter — Extract individual pages or custom page ranges from a PDF as separate downloadable files.
PDF Page Rotator — Rotate selected pages in a PDF by 90°, 180°, or 270°. Choose any combination of pages.
PDF to Image — Render PDF pages to PNG or JPEG at 72, 150, or 300 DPI. Download individually or all at once.
Image to PDF — Combine up to 30 PNG/JPG/WebP images into a single PDF. Choose page size and orientation.
PDF Page Counter — Count the number of pages in a PDF file instantly. Shows file size and a visual page grid.
PDF Metadata Editor — View and edit PDF metadata: title, author, subject, keywords, and creator. Download the updated PDF.
PDF Delete Pages — Remove specific pages from a PDF. Enter page numbers or ranges (e.g. 1,3,5-8) and download the result.
PDF Extract Pages — Extract specific pages from a PDF into a new file. Enter page numbers or ranges to keep.
PDF Watermark — Add a text watermark to every page of a PDF. Customize text, opacity, size, rotation, and color.
PDF Page Numbering — Add page numbers to a PDF. Choose position (top/bottom, left/center/right), starting number, prefix, and suffix.
PDF Text Extractor — Extract all text from a PDF file. Page-by-page extraction with word and character count.
PDF Unlock / Remove Restrictions — Remove editing and printing restrictions from PDFs. For password-protected PDFs, you must know the password.
HTML to PDF — Convert HTML markup to a PDF file. Paste HTML and download as an A4, A3, or Letter PDF.
PDF Page Reorder — Reorder pages in a PDF by specifying the new page order (e.g. 3,1,2). Download the rearranged PDF.
PDF to Markdown Converter — Convert PDF text to Markdown format. Extracts text with basic structure detection for headers and bullets.
PDF Redact — Add black redaction boxes to PDF pages. Specify areas by page and percentage coordinates.
PDF Page Size Converter — Convert PDF pages to a different size: A4, A3, A5, Letter, Legal, or custom dimensions.
PDF Header & Footer — Add header and footer text to every page of a PDF. Supports {page}, {total}, and {date} tokens.
PDF Crop — Crop PDF pages by setting margins. Remove borders, headers, or whitespace from all pages.
PDF Compressor — Lossless structure compression of PDFs — removes redundant objects. Typical savings: 5–30%.
PDF Form Filler — Fill PDF form fields without Adobe Acrobat. Detects form fields automatically and lets you type values.
PDF to Excel Converter — Extract tables and text from a PDF into an Excel .xlsx spreadsheet.
EPUB to PDF Converter — Convert EPUB e-books to PDF format in your browser.
PDF to EPUB Converter — Convert PDF documents to EPUB e-book format in your browser.
Word to PDF Converter — Convert .docx Word documents to PDF in your browser.
PDF to Word Converter — Extract text from a PDF and download as an editable .docx file.

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Built by Minal Goel, Senior Product Manager specialising in AI and platform products.