Human-readable index
Everything published on 77 Toolkit
Use this page to browse the complete collection without search or filters. The XML sitemap for search engines remains available at /sitemap.xml.
Developer Tools
- JSON FixRepair malformed JSON and turn it into clean, readable data.
- JSON DiffCompare two JSON documents and inspect added, removed, and changed values.
- Timestamp ConverterConvert Unix timestamps and local dates while keeping an eye on the current time.
- JWT DecoderDecode JWT headers and payloads locally without sending tokens to a server.
- Base64 EncoderEncode or decode UTF-8 text with standard and URL-safe Base64.
- Regex TesterTest regular expressions, inspect capture groups, and highlight every match.
- UUID GeneratorGenerate secure UUID v4 values in batches and validate existing UUIDs.
- Hash GeneratorCalculate SHA-256, SHA-384, or SHA-512 hashes for text and local files.
Text Tools
- Text CleanRemove copied rich-text and AI formatting while preserving readable structure.
- Text DiffCompare text line by line with a clear view of additions and removals.
- Case ConverterSwitch text between common writing and programming case styles.
- Line ProcessorClean, sort, reverse, number, prefix, or deduplicate lists of lines.
- Word CounterMeasure words, characters, sentences, lines, reading time, and common terms.
Image Tools
- Color SpectrumExtract dominant colors, inspect pixels, and export palettes from an image.
- Image CompressorReduce image file size locally with an adjustable quality setting.
- Image ResizerResize images to exact dimensions while optionally preserving aspect ratio.
- Image Format ConverterConvert images between PNG, JPEG, and WebP entirely in the browser.
- Color Contrast CheckerCheck foreground and background colors against WCAG contrast targets.
- Image Metadata RemoverStrip EXIF and other metadata by safely re-encoding an image locally.
Web Tools
- URL ParserBreak an absolute URL into its origin, path, query parameters, and fragment.
- URL EncoderEncode or decode URL components without sending addresses to a remote service.
- CSV ↔ JSON ConverterConvert quoted CSV records and JSON object arrays in either direction locally.
- HTML Entity EncoderEncode HTML-sensitive characters or decode named and numeric character references.
- CSS Unit ConverterCompare px, rem, em, vw, and vh values using explicit layout assumptions.
Practical Guides
- Why a command works outside tmux but gets permission denied insideA process-focused workflow for comparing users, groups, environment variables, path permissions, ACLs, and mount context before changing access.
- Why GitHub shows the wrong commit author and how to fix itUnderstand author, committer, and pusher identities; diagnose email-based attribution; and configure local or automated commits safely.
- How to repair invalid JSON without changing its meaningA careful workflow for fixing JSON syntax, reviewing inferred changes, and validating the result before it returns to an application.
- JWT decoding is not JWT verificationUnderstand what a decoded token can show, what signature verification proves, and which application checks still remain afterward.
- Base64 is an encoding, not encryptionLearn why Base64 values are readable, how standard and URL-safe alphabets differ, and what to use when security is the real requirement.
- PNG, JPEG, and WebP: choose by image contentA practical comparison of common browser image formats, compression artifacts, transparency, resizing, and repeat export quality.
- Removing image metadata is one part of privacyUnderstand what re-encoding can remove, what it may change, and which visible or platform-level clues remain after EXIF cleanup.
- How to use WCAG contrast ratios in real interfacesMove from two hexadecimal colors to a practical review of text size, component states, opacity, images, and implemented accessibility.
- Unix timestamps, UTC, and local time without surprisesA debugging guide to seconds versus milliseconds, explicit offsets, daylight-saving transitions, and trustworthy date exchange.
- Test regular expressions with correctness and performance in mindBuild representative test sets, understand engine differences, and reduce the risk of patterns that become slow on adversarial input.
- URL encoding without broken query parametersUnderstand URL structure, component encoding, repeated query keys, plus signs, Unicode hosts, and the difference between parsing an address and trusting it.