Free tools for developers & makers
Privacy-first web utilities we built because we use them daily. No accounts, no watermarks, no ads. Paste or upload — get what you need, and leave.
A sharper set of dev utilities — without the dark patterns
Most online utilities hide rate limits behind signups, bury features behind paywalls, or run analytics on every keystroke. These don't.
No signup, ever
Click and go. No forms, no verification emails, no waiting for a confirmation link. Every tool is usable in the first second you land on it.
Stays in your browser
10 of 12 tools run 100% locally. Even for the two that need a server, we stream your input through memory and never persist it — read our privacy notes on each page.
Zero ads, zero tracking
No Facebook pixel. No affiliate links. No sneaky redirects. The tool pages are GA4-instrumented only for aggregate usage counts — nothing about what you paste.
Built because we use them
Every tool here is one we reach for daily — formatting JSON, debugging JWTs, converting Markdown. If it wasn't something we'd bookmark ourselves, we didn't ship it.
Developer utilities
Daily-use formatters, decoders, and converters. Save a bookmark.
Markdown to PDF
Convert Markdown to a typeset PDF with code highlighting and LaTeX math. Free, no signup, no watermark.
Open toolJSON Formatter
Format, validate, minify, and auto-fix JSON in your browser. Fixes trailing commas, unquoted keys, single quotes, comments, and more.
Open toolBase64 Encoder / Decoder
Encode and decode Base64 text. Supports UTF-8, URL-safe variant, and line-wrapping.
Open toolUUID Generator
Generate v4 UUIDs (1 to 1000 at a time). Lowercase, uppercase, or brace-wrapped. Copy or download.
Open toolRegex Tester
Test regular expressions with flags (g, i, m, s, u, y). Live match highlighting, capture groups, flag reference.
Open toolCase Converter
Convert text between snake_case, camelCase, PascalCase, kebab-case, CONSTANT_CASE, Title Case, and more.
Open toolURL Encoder / Decoder
Percent-encode and decode URL components. Full-URL mode preserves scheme and host; component mode escapes reserved chars.
Open toolHTML to PDF
Convert raw HTML (or paste-in webpages) to a typeset PDF. Custom CSS, A4 / Letter, syntax-highlighted code, perfect tables.
Open toolPDF Merger / Splitter
Combine multiple PDFs in any order, or extract specific page ranges. Up to 100 files on Pro+. Privacy-first, files are never persisted.
Open toolPDF Compressor
Shrink PDF filesize without quality loss. Picks the most efficient encoding. Up to 100 MB on Pro+.
Open toolCSV ↔ JSON Converter
Convert CSV (with headers, custom delimiters) to JSON, or JSON arrays back to CSV. Type-aware parsing, error reporting.
Open toolYAML ↔ JSON Converter
Convert YAML to JSON or JSON to YAML. Useful for Kubernetes manifests, GitHub Actions, OpenAPI specs.
Open toolJSON to TypeScript
Generate TypeScript interfaces from a JSON sample. Powered by quicktype, prefers unions, accurate optional inference.
Open toolJSON Validator & Diff
Validate JSON against a JSON Schema, or diff two JSON documents and see exactly what changed. Per-field reports.
Open toolMarkdown Table Editor
Paste CSV or TSV, get a perfect Markdown table back. Per-column alignment, escapes pipes and newlines for you.
Open toolCron Expression Generator
Convert cron syntax to plain English, validate, and preview the next 5 fires in your timezone. Supports 5- and 6-field cron.
Open toolGitHub README Generator
Generate a clean README.md from a few inputs: project name, tagline, features, tech stack, install + usage. Copy-paste ready.
Open toolSecurity & auth
Password generation and JWT inspection — both run entirely in your browser.
Design & assets
Generate palettes, QR codes, and favicon bundles in one shot.
QR Code Generator
Generate QR codes for URLs, Wi-Fi, contact cards, or plain text. Custom colors and error-correction levels.
Open toolDynamic QR Codes
QR codes you can edit anytime — change destination URL without reprinting. Track scans by date, country, device. Pro feature.
Open toolColor Palette Generator
Generate harmonious color palettes from a seed color. Monochrome, analogous, complementary, triadic, and tetradic schemes.
Open toolFavicon Generator
Upload an image and get a ZIP with favicon.ico, all PNG sizes, Apple touch icon, site.webmanifest, and a paste-ready HTML snippet.
Open toolImage Compressor
Compress JPG, PNG, WebP, AVIF without visible quality loss. mozjpeg encoder. Resize on the fly.
Open toolImage Format Converter
Convert between JPG, PNG, WebP, and AVIF. mozjpeg encoder for smallest JPGs. Free with sensible daily limits.
Open toolImage Background Remover
AI background removal — strip the backdrop from any photo and download a transparent PNG. Pro+ feature.
Open toolOG Image Generator
Generate 1200×630 social-share images from a title + subtitle. 3 templates, custom colors. Free with limits.
Open toolSVG Optimizer
Minify SVG files via svgo. Strips IDs, comments, redundant attributes. Often shaves 30-70% off filesize.
Open tool