Zero Install. Zero Sign-up. Zero Data Leaving Your Browser.
Browser-based free utilities. No install, no account — nothing is sent to a server, everything runs locally in your browser.
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Data Format
JSON Formatter & Validator
Validate JSON in real time, beautify or minify it, visualize it as a tree, and convert it to TypeScript interfaces.
Open tool → ☆XML Formatter & Viewer
Validate XML in real time (well-formedness check), beautify or minify it, visualize it as a tree, and convert it to JSON.
Open tool → ☆JSON Diff (Compare)
Compare two JSON documents side by side, see added/removed/changed items as a tree or text, and share the result with a link.
Open tool → ☆CSV ↔ JSON Converter
Convert CSV to JSON, or JSON back to CSV. Large files stream so the tab never freezes.
Open tool → ☆YAML ↔ JSON Converter
Convert YAML to JSON, or JSON to YAML. Handy for Kubernetes/Docker Compose config files.
Open tool →Encoding / Decoding
Base64 Encoder / Decoder
Encode text or files to Base64, or decode Base64 back to text/files.
Open tool → ☆JWT Decoder & Signature Verifier
Decode a JWT's header/payload, check its expiration (exp), and verify its signature (HS/RS/PS/ES) in your browser.
Open tool → ☆URL Encoder / Decoder
Percent-encode or decode URLs and query strings.
Open tool → ☆Hash Generator
Instantly compute MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes of text or a file.
Open tool → ☆UUID Generator
Generate random UUID v4 or time-ordered UUID v7, in bulk.
Open tool → ☆Unix Timestamp Converter
Convert a timestamp (seconds/ms) to a date and back, with a live-updating current time.
Open tool →Text
Text Diff
Compare any two texts or code snippets side by side, or as a git-style Unified Diff, with word-level highlighting and shareable links.
Open tool → ☆Text Splitter
Split long text into fixed-size chunks and copy any chunk individually.
Open tool → ☆Regex Tester
Match a regex against a test string live, with highlighting, a match list, capture groups, and a replace preview.
Open tool →Image / File Conversion
ICO ↔ PNG/JPG Converter
Turn an image into a multi-size ICO icon, or extract images out of an ICO.
Open tool → ☆PDF ↔ JPG Converter
Extract PDF pages as JPG/PNG, or combine several images into one PDF.
Open tool → ☆Layer Image Editor
Place multiple images and text on a fixed-size canvas, then crop and remove flat backgrounds.
Open tool → ☆Image Resizer
Resize PNG/JPG by pixels or percentage. Presets for 16×16, 32×32, 48×48, 500×500, 1000×1000.
Open tool →What can you do here?
Validate, format, and minify JSON and compare two JSON documents; compare any two texts or code snippets with Text Diff; encode/decode Base64 and URLs; decode and verify JWT tokens; convert between CSV and JSON; turn images into ICO icons (and back); convert between PDF and images; compose multiple images and text with the layer image editor; turn a webpage's HTML into llms.txt-style Markdown with the LLM Markdown Converter — everyday developer tasks, done right in your browser without installing anything. All processing happens in client-side JavaScript, and nothing you enter is sent to a server or stored.
Frequently Asked Questions
Do I need to sign up?
No. Every tool works instantly with no account or login required.
Is my data stored or sent anywhere?
No. Each tool processes data entirely in your browser and never sends it to a server.
Will more tools be added?
Yes, we plan to keep adding developer utilities over time. Let us know if there's a tool you'd like to see.