A fast, privacy-first toolkit for JSON, code formatting, JWT inspection, image processing, network calculations, Markdown preview, and everyday developer cleanup work.
Format, validate, and explore JSON with syntax highlighting, tree view, minimap, and local history.
Validate JSON against JSON Schema, generate starter schemas, and inspect Ajv validation errors locally.
Convert between JSON, YAML, and CSV for configs, API examples, and fixtures.
Format JavaScript, TypeScript, JSON, CSS, HTML, Markdown, and YAML with Prettier in the browser.
Convert Unix timestamps, compare timezones, and detect timestamps in logs.
Decode JWT headers and payloads, inspect timing claims, and copy token sections locally.
Inspect EXIF, GPS, XMP, IPTC, and image headers, edit JPEG EXIF, and view photo GPS on a map.
Compress, resize, convert, compare savings, and download JPG, PNG, WebP, and AVIF images locally.
Tools run in your browser and avoid server round-trips for everyday data.
Tools still run in your browser. Analytics helps us improve the product experience.
Each tool has a stable URL, canonical metadata, sitemap entry, and structured data.
Pick a task-oriented category and open the utility directly. Every live tool is also included in the sitemap and web app manifest where appropriate.
Inspect, transform, validate, and model structured data.
Format, validate, and explore JSON with syntax highlighting, tree view, minimap, and local history.
Validate JSON against JSON Schema, generate starter schemas, and inspect Ajv validation errors locally.
Convert between JSON, YAML, and CSV for configs, API examples, and fixtures.
Generate TypeScript interfaces from representative JSON payloads locally.
Preview OpenAPI and Swagger specs, inspect endpoints, and copy request summaries from JSON or YAML.
Format source code, convert snippets, and clean API examples.
Format JavaScript, TypeScript, JSON, CSS, HTML, Markdown, and YAML with Prettier in the browser.
Format SQL queries, switch dialects, minify output, and copy clean database snippets.
Convert cURL commands into fetch, axios, Python requests, and readable request details.
Decode tokens, verify signatures, generate secrets, and calculate hashes locally.
Decode JWT headers and payloads, inspect timing claims, and copy token sections locally.
Verify HS256 JWT signatures, inspect JWK fields, and convert shared secrets without sending tokens away.
Generate SHA hashes, HMAC signatures, and local file checksums with Web Crypto.
Generate strong passwords and passphrases, then inspect otpauth/TOTP codes locally.
Encode, decode, and inspect Base64 variants with client-side processing.
Create UUID v4, ULID, and Nano ID batches for tests, fixtures, databases, and APIs.
Compress, resize, inspect metadata, and prepare images in the browser.
Inspect EXIF, GPS, XMP, IPTC, and image headers, edit JPEG EXIF, and view photo GPS on a map.
Compress, resize, convert, compare savings, and download JPG, PNG, WebP, and AVIF images locally.
Compress local images and folders into WebP, JPEG, PNG, or AVIF with progress and ZIP downloads.
Batch resize, rename, watermark, strip metadata, and export optimized images from one local workspace.
Capture, preview, and export local media without server uploads.
Work with URLs, QR codes, IP ranges, schedules, and compressed payloads.
Convert Unix timestamps, compare timezones, and detect timestamps in logs.
Validate five-field cron expressions, use presets, and preview upcoming run times.
Encode and decode URL components safely for query strings, logs, and API payloads.
Generate QR code PNGs and decode QR images without uploading payloads.
Calculate IPv4 CIDR ranges, subnet masks, wildcard masks, host counts, and membership checks.
Compress and decompress text with gzip and deflate using the browser Compression Streams API.
Convert color formats, check contrast, and build accessible palettes.
Compare, search, preview, and reshape text documents.
Test JavaScript regular expressions, flags, indexes, and capture groups in real time.
Compare text or JSON snippets line by line and copy a unified diff locally.
Preview Markdown, render Mermaid diagrams, and copy clean HTML from local document drafts.