Free developer tools that never see your data.
30 everyday utilities, built by our engineers and run entirely in your browser. No sign-up, no uploads, no tracking of what you paste.
Data & formats
Format, convert and compare the data your code passes around.
JSON Formatter
Format, minify and validate JSON with the exact line and column of any error, plus a tree view.
JSON to TypeScript
Paste JSON, get TypeScript interfaces: nested types, merged array items, optional fields and unions.
YAML to JSON Converter
YAML to JSON and back, with exact error positions, multi-document files, anchors and the YAML 1.1 Norway problem flagged.
CSV to JSON Converter
CSV to JSON and JSON to CSV per RFC 4180, with delimiter auto-detection, type inference and a table preview.
SQL Formatter
Format or minify SQL for PostgreSQL, MySQL, SQL Server, SQLite, BigQuery and Snowflake, with located syntax errors.
Text Diff Checker
Compare two texts line by line with word-level highlights, side by side or unified, using the Myers algorithm.
Markdown Viewer
Write or open Markdown and see a live, safe preview with GFM tables, task lists and code, then export HTML.
Encoding & security
Decode tokens, encode payloads and generate secrets without pasting them into someone else's server.
JWT Decoder
Read a token's header and payload, with exp and iat as human dates. Decoding only, never verification.
Base64 Encoder
UTF-8 safe Base64 and Base64URL for text, and any file to a data URL, all in your browser.
URL Encoder
Percent-encode or decode text and URLs, see the difference between component and full-URL encoding, and parse query strings.
Hash Generator
SHA-1, SHA-256, SHA-384, SHA-512 and MD5 for text or files, with a checksum compare box.
Password Generator
Strong random passwords from crypto.getRandomValues, with length, character sets and entropy explained.
UUID Generator
Cryptographically secure version 4 UUIDs in bulk, with copy, uppercase and download options.
Web & SEO
Ship pages that load fast, preview well when shared and say the right things to search engines and AI crawlers.
Meta Tag Generator
Title, description, Open Graph and X tags with live Google, Facebook, LinkedIn, X and Slack previews.
Schema Markup Generator
JSON-LD for Organization, LocalBusiness, Article, Product, FAQ, Breadcrumb, Event and SoftwareApplication.
Robots.txt Generator
Build robots.txt with AI crawler controls (GPTBot, ClaudeBot, Google-Extended…) and test any URL per bot.
HTTP Status Codes
Every standard HTTP status code with its RFC 9110 meaning and when to use it. Searchable and linkable.
Image Compressor
Compress, resize and convert images to WebP, JPEG, PNG or AVIF in your browser, with a before/after slider.
Favicon Generator
The modern favicon set from text, an emoji or a logo: ICO, SVG, Apple touch icon and manifest icons.
QR Code Generator
Static QR codes for links, text, Wi-Fi, contacts and email, with colours, a centre logo, PNG and SVG.
Design & CSS
Colour, contrast and gradients in modern colour spaces, ready to paste into CSS or Tailwind.
Color Converter
HEX, RGB, HSL, OKLCH and CMYK conversion, OKLCH palettes and a Tailwind-style 50–950 scale with CSS export.
Contrast Checker
WCAG 2.x contrast ratios with AA and AAA results, a live preview and the nearest passing colour.
CSS Gradient Generator
Linear, radial and conic gradients with draggable stops and OKLCH interpolation, plus a layered box-shadow builder.
Text & patterns
Count, convert and match text the way your code will.
Regex Tester
Live JavaScript regex matching with highlighted results, flags and a capture-group table.
Word Counter
Words, characters, sentences, reading time, keyword density and live limits for X, LinkedIn, meta descriptions and SMS.
Case Converter
Convert text to camelCase, snake_case, kebab-case, CONSTANT_CASE, Title Case by style guide, sentence case or a URL slug.
Time, networks & AI
Timestamps, schedules, subnets and token budgets, worked out for you.
Timestamp Converter
Unix seconds and milliseconds to dates and back, in any time zone, with ISO 8601 and relative time.
Cron Explainer
Turn a 5-field cron expression into plain English and see the next five run times in your time zone.
Subnet Calculator
IPv4 CIDR calculator with network, broadcast, host range, masks and a binary view, subnet splitting and IPv6 prefixes.
LLM Token Estimator
Approximate token counts for prompts and documents, and how much of a context window they use.
Private by design, not by policy.
Runs on your device
Every tool is plain JavaScript in this page. Your JSON, tokens, files and prompts are processed in the tab and never sent to a server.
No account, no limits
Nothing to sign up for and no daily caps. Bookmark the tool and it is there when you need it.
Built on web standards
Native browser APIs such as crypto.randomUUID, TextEncoder and FileReader, so results match what your code will do.
Want tools like these built for your team?
Internal tools, developer platforms and APIs are what we do every day. Tell us what your team keeps doing by hand.
- 01
Share the brief
Use the form, call, or message us on WhatsApp. A few lines is enough.
- 02
Reply within one business day
A solutions consultant answers, Mon to Sat, 09:30 to 18:30 IST.
- 03
Next steps, estimate and team
A rough estimate and a suggested team, before you commit to anything.