Free Developer, Writing & SEO Tools
42 utilities for coding, content and everyday web tasks. No ByteVerse account required.
Many operations process inputs in your browser. Optional AI features send the text you submit to our server and an AI provider; website discovery and URL checks also use server requests. Speech voices and embedded previews can use external services. Review each tool's limitations and avoid entering confidential data. See our privacy policy for site-wide data practices.
JSON Formatter & Validator
Format, validate and minify JSON with syntax error feedback and adjustable indentation.
Password Generator
Generate random passwords with Web Crypto and configurable length and character options.
Meta Tag Generator
Build title, description, Open Graph and Twitter Card tags with illustrative previews.
SEO Title Checker
Measure title characters and approximate pixels, preview desktop/mobile snippets and compare three drafts.
Base64 Encoder & Decoder
Encode UTF-8 text to Base64 or decode it back to text in your browser.
Word & Character Counter
Count words, characters, sentences and paragraphs with estimated reading time.
Readability Checker
Estimate English reading ease and grade level, and review long sentences and complex words.
llms.txt Generator & Validator
Draft and check llms.txt structure. Website discovery and URL checks use server requests.
Regex Tester
Test JavaScript regular expressions with match highlighting, flags and replacement previews.
JWT Decoder
Inspect token headers, payloads and expiry. Decoding does not verify the signature or establish trust.
Hash Generator
Compute and compare SHA-1, SHA-256, SHA-384 and SHA-512 digests with Web Crypto.
UUID Generator
Generate random v4 UUIDs in bulk or try the clearly labeled experimental v1-like mode.
Unix Timestamp Converter
Convert Unix seconds or milliseconds to dates and back, with UTC and local-time views.
URL Encoder & Decoder
Encode or decode URLs and query components, and inspect a URL's individual parts.
Diff Checker
Compare two pasted texts and see line-by-line additions, deletions and unchanged content.
Open Graph Preview
Mock up social share cards from your title, description and image. This is not a live URL audit.
robots.txt Generator
Build crawler directives with user-agent groups, allow/disallow rules and sitemap URLs.
Schema Markup Generator
Build JSON-LD for articles, products, businesses and more; validate eligibility before publishing.
Slug Generator
Turn Latin-script titles into URL slugs with separator and case options; review non-Latin text manually.
CSS Gradient Generator
Create linear and radial CSS gradients with multiple color stops and a live preview.
Color Converter
Convert HEX, RGB and HSL values using a visual picker and editable color controls.
Box Shadow Generator
Build layered CSS shadows and adjust offset, blur, spread, color and opacity.
AI Content Detector
Explore heuristic writing-style signals. Results cannot establish whether text was written by AI.
Text Similarity Checker
Compare a draft with up to five supplied sources, review matching phrases or repeated sentences locally. No web scan or originality verdict.
Live HTML Editor
Try HTML, CSS and JavaScript with a sandboxed preview, starter templates and layout controls.
HTML Tag Generator & Remover
Wrap plain text in basic HTML tags or strip tags to recover text for editing.
Text Rewriter & Paraphrasing Tool
Try local rephrasing or optional server-based AI rewriting. Rewriting does not remove citation obligations.
Code Formatter & Beautifier
Format JSON and try basic formatting for other languages. Review output before using it in production.
YouTube Tag Generator
Brainstorm tag ideas from a video title. Suggestions are not search-volume data or ranking forecasts.
Text to Speech Reader
Listen to text using voices available in your browser or OS. Voice availability varies; there is no MP3 export.
QR Code Generator
Create QR codes for URLs, text, Wi-Fi and email, then download PNG or SVG output.
Image Compressor
Resize and re-encode JPG, PNG and WebP images in your browser, comparing input and output sizes.
Cron Expression Generator
Build five-field cron expressions from schedule presets and review the generated syntax.
AI Prompt Generator
Assemble structured prompt templates with a goal, context, tone and constraints; no AI request is needed.
AI CV Builder
Edit a CV with templates and PDF export. Optional AI writing features send the supplied text to a server.
Lorem Ipsum Generator
Generate placeholder words, sentences or paragraphs with optional HTML wrapping.
Markdown to HTML Converter
Convert basic Markdown into HTML for review and copying; inspect complex documents before publishing.
JSON to CSV Converter
Convert JSON or JSON Lines to CSV locally: choose rows, flatten nested fields, expand one array and preview columns with formula-risk protection.
Invoice PDF to Excel
Extract summary fields from selectable-text invoice PDFs, review each invoice and export XLSX or CSV locally. No OCR.
Privacy Policy Template Generator
Draft an editable website policy template. Review it against your real data practices and legal requirements.
JSON to TypeScript Converter
Infer interfaces or types from JSON and JSON Lines locally. Review optional fields, nulls and mixed arrays; download complete declarations.
CSS Flexbox Generator
Explore flex direction, alignment, wrapping and gaps with a live layout preview and copyable CSS.