Tools that just work.
A collection of free web tools that run entirely in your browser. No uploads, no login, no tracking.
Private by default
Every tool runs in your browser. Your files, tokens, and text never touch our servers.
Instant and unlimited
No rate limits, watermarks, or daily quotas. Open a tab and use it.
No account required
Every tool is free to use without signing up or logging in. Ever.
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Popular
API Client
Send HTTP requests and organize collections in your browser. Share collections via end-to-end encrypted links — server never sees your data.
JSON Formatter
Format, validate, and beautify JSON data with syntax highlighting.
URL Encoder/Decoder
Encode or decode URL components and query strings.
Diff Checker
Compare two texts side by side with inline diff highlighting.
Epoch Converter
Convert between Unix timestamps and human-readable dates.
Base64 Encoder/Decoder
Encode text to Base64 or decode Base64 back to text.
Color Converter
Convert between HEX, RGB, and HSL color formats with live preview.
Lorem Ipsum Generator
Generate placeholder text by paragraphs, sentences, or words.
QR Code Generator
Generate QR codes from text, URLs, or any data. Download as PNG.
UUID Generator
Generate UUID v4 and v7 identifiers. Bulk generate and copy.
All Tools
JSON Formatter
Format, validate, and beautify JSON data with syntax highlighting.
API Client
Send HTTP requests and organize collections in your browser. Share collections via end-to-end encrypted links — server never sees your data.
QR Code Generator
Generate QR codes from text, URLs, or any data. Download as PNG.
Text Counter
Count words, characters, sentences, and paragraphs in your text.
Epoch Converter
Convert between Unix timestamps and human-readable dates.
Base64 Encoder/Decoder
Encode text to Base64 or decode Base64 back to text.
Image to Base64
Convert images to Base64 data URIs and Base64 strings back to images.
UUID Generator
Generate UUID v4 and v7 identifiers. Bulk generate and copy.
JSON to TypeScript
Paste JSON and get TypeScript types and interfaces instantly.
Regex Tester
Test regular expressions with live matching, highlighting, and capture groups.
Diff Checker
Compare two texts side by side with inline diff highlighting.
Color Converter
Convert between HEX, RGB, and HSL color formats with live preview.
JWT Decoder
Decode JSON Web Tokens to inspect header, payload, and expiry.
URL Encoder/Decoder
Encode or decode URL components and query strings.
Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from text.
Markdown Preview
Write Markdown and see the rendered output live side by side.
Lorem Ipsum Generator
Generate placeholder text by paragraphs, sentences, or words.
Password Generator
Generate strong passwords with configurable length and character types.
Unit Converter
Convert between units of length, weight, temperature, and data size.
Number Base Converter
Convert numbers between decimal, binary, hexadecimal, and octal.
CSS Unit Converter
Convert between px, rem, em, vh, and vw with configurable base size.
Edit PDF
Merge multiple PDFs, delete pages, rotate pages, and reorder pages in your browser.
Remove Background
Remove image backgrounds automatically using AI — 100% in-browser, no uploads.
Image Resizer
Resize images to exact dimensions or by percentage. Preserves aspect ratio.
Image Compressor
Compress JPEG, PNG, and WebP images to reduce file size without losing quality.
Image Cropper
Crop images with free or preset aspect ratios. Rotate, flip, and export as PNG, JPEG, or WebP.
PDF Merge
Combine multiple PDFs into one file. Drag to reorder, all in your browser.
PDF Split
Split a PDF into separate files by page ranges. Fully in-browser.
PDF Compress
Shrink PDF file size in your browser by re-encoding embedded images.
PDF to Image
Convert each PDF page to a PNG or JPG image. All processing happens in your browser.
Image to PDF
Turn one or many images into a single PDF document, entirely in your browser.
Image Format Converter
Convert images between PNG, JPG, and WebP formats with quality control. 100% in-browser.
SVG Optimizer
Minify and optimize SVG files in your browser. Strip metadata, reduce paths, shrink file size.
Image Color Picker
Pick colors from any image or extract its dominant color palette. 100% in-browser.
Favicon Generator
Generate favicon PNGs for every platform from a single source image. All processing in your browser.
EXIF Viewer & Stripper
Inspect or remove EXIF metadata (camera, GPS, timestamp) from your photos. Everything runs in your browser.
GIF Maker
Build animated GIFs from a series of images, entirely in your browser.
YAML ↔ JSON
Convert between YAML and JSON bidirectionally. All processing in your browser.
CSV ↔ JSON
Convert between CSV and JSON, with header control. Fully in-browser.
XML ↔ JSON
Convert between XML and JSON, or just format XML. Fully in-browser.
SQL Formatter
Beautify SQL queries across dialects — PostgreSQL, MySQL, SQLite, and more. 100% in-browser.
Mock JSON Generator
Generate arrays of realistic fake data for testing — users, products, addresses, and custom schemas.
HTML/CSS/JS Beautifier
Beautify or minify HTML, CSS, and JavaScript/TypeScript — all in your browser.
Cron Expression Builder
Explain cron expressions in plain English and preview the next runs. All client-side.
Case Converter
Convert between camelCase, snake_case, kebab-case, PascalCase, CONSTANT_CASE, Title Case, and more.
Slugify
Turn any string into a URL-safe slug. Live preview, all in your browser.
Box Shadow Generator
Visually design CSS box-shadows with a live preview. Supports multi-layer stacks.
CSS Gradient Generator
Design linear, radial, and conic CSS gradients with a live preview.
Border Radius Generator
Visually design CSS border-radius shapes — from simple rounded corners to organic blobs.
QR Code Reader
Decode QR codes from images or your webcam — entirely in your browser.
Barcode Generator
Generate CODE128, EAN13, UPC, and other linear barcodes. 100% in-browser.
JSON Diff
Structural diff of two JSON objects — highlights added, removed, and changed keys.
Timezone Converter
Convert a date/time across multiple timezones at once. All client-side.
HMAC Generator
Generate HMAC signatures (SHA-1/256/384/512) from a message and secret key. Uses WebCrypto.
AES Encrypt/Decrypt
Encrypt or decrypt text with a passphrase using AES-GCM. Runs entirely in your browser.
BIP39 Mnemonic Generator
Generate BIP39 seed phrases (12/15/18/21/24 words) offline in your browser. Useful for cryptocurrency wallets.
Zip / Unzip
Create zip archives or extract them — entirely in your browser. No uploads.
Unicode Inspector
Inspect Unicode code points, escapes, normalization forms, and byte breakdowns of any string.
JS Obfuscator
Obfuscate JavaScript source code with low / medium / high presets — entirely in your browser.
BMI Calculator
Calculate Body Mass Index from height and weight. Shows WHO classification. 100% in-browser.
BMR Calculator
Estimate Basal Metabolic Rate using the Mifflin-St Jeor equation. Calories you burn at rest.
TDEE Calculator
Estimate Total Daily Energy Expenditure from BMR and activity level. Plus maintenance and calorie-target suggestions.
Ideal Weight Calculator
Compare four published methods — Hamwi, Devine, Robinson, Miller — side by side.
Body Fat Percentage
Estimate body fat % using the US Navy (Hodgdon-Beckett) circumference method.
Pregnancy Due Date Calculator
Estimate due date, gestational age, and trimester from your last menstrual period (Naegele's rule).
Ovulation Calculator
Find your expected ovulation date and fertile window based on your last period and cycle length.
Menstrual Period Calendar
Project your next six menstrual cycles on a calendar grid from a single last-period date.