Input stays local when stated
Core text, encoding, token, hash, PDF and ZIP operations use client-side JavaScript. Tool pages identify exceptions instead of making a blanket claim.
BROWSER TOOLS FOR REAL WORK
Free online developer tools that get out of your way
免费、直接、在浏览器里完成
Format JSON, decode Base64, test regular expressions, convert timestamps and handle everyday text or file tasks. No account, no installation, and most tool inputs never leave your device.
- Useful immediately — no signup wall or forced download
- Browser-local processing is stated on each relevant tool
- Keyboard-friendly, responsive, and tested with invalid input
Private by design
Most inputs stay in the browser.
Plain and predictable
The tool comes before the explanation.
Free to use
No account, subscription or usage meter.
FEATURED DEVELOPER WORKFLOW
Fix an MCP config before debugging the server
Validate Claude, Cursor, VS Code or Gemini JSON and Codex TOML. The Config Doctor finds wrapper, transport, argument and credential mistakes, then converts a working definition to another client—all inside your browser.
JSON ↔ TOML6 clientsSecret warningsActionable errors
SPECIALIZED FILE WORKFLOW
Check the final Gerber ZIP, not just one PCB layer
Preflight a complete fabrication package for missing copper, outline and drill files, mixed units, duplicate roles and suspicious coordinate envelopes. Everything runs locally, with shareable HTML and JSON reports.
ZIP package checkLayer completenessMixed-unit alertsHTML report
Find the right tool
Search the hand-picked essentials below or continue to the complete directory.
19 essential tools
Essential developer tools
The most broadly useful utilities, selected for the homepage. The complete directory includes additional text, file, frontend and maker tools.
JSON Formatter
JSON 格式化与校验
Format, validate and minify JSON with clear parser errors.
Base64 Encoder
Base64 编码与解码
Convert text to Base64 and decode it back in your browser.
Timestamp Converter
Unix 时间戳转换
Convert seconds or milliseconds to readable local and UTC dates.
Regex Tester
正则表达式测试
Test patterns against sample text and inspect live matches.
JWT Decoder
JWT 本地解析
Inspect JWT headers, claims and expiry without sending the token away.
Hash Generator
哈希摘要计算
Generate MD5, SHA-1, SHA-256 and SHA-512 digests.
UUID Generator
UUID / GUID 生成
Create one or many identifiers and copy them immediately.
URL Encoder
URL 编码与解码
Encode query values or decode percent-encoded text.
Keyword Workbench
关键词组合与 Ads CSV
Combine or clean keyword lists, preflight match types and export Google Ads Editor CSV.
Cron Parser
Cron 表达式解析
Read a cron schedule and preview its next run times.
Text Diff
文本差异对比
Compare two blocks of text with line-level differences.
Text Workbench
文本转换工作台
Chain 34 case, line-cleanup, extraction and inspection operations in one local workspace.
Typing Speed Test
1 / 3 / 5 分钟 WPM 测试
Measure WPM and corrected-keystroke accuracy locally with timed or custom passages.
Encoding Workbench
编码与数据转换
Convert Base64URL, hex, binary, JSON escapes, CSV and query strings without uploading values.
Markdown Table
Markdown 表格生成
Build, align and copy Markdown tables from a visual editor.
Password Generator
随机密码生成
Create passwords locally with adjustable character sets and length.
QR Code Generator
二维码生成
Create a standard QR code from text or a URL and download it.
Local PDF Toolkit
PDF 本地处理
Split pages or add a watermark without uploading the document.
ZIP Extractor
ZIP 本地解压
Inspect and extract ZIP archives directly on your device.
What “browser-based” means here
A concrete product promise, not a marketing label.
Useful before monetization
The working controls and result area are the primary content. There is no login gate, fake download button or multi-page funnel before the result.
Reviewed as software
Representative valid, empty and malformed inputs are checked, along with JavaScript syntax, internal links and small-screen behavior.
Read the testing and corrections policy, privacy policy, or report a problem.
Frequently asked questions
Does EasyTool upload my input?
Most tools process input on your device. The individual tool page explains any external library, resource or outbound service it uses. Analytics events never include tool input values.
Do I need an account or subscription?
No. Tools open directly and are free to use without registration.
Why are there ads and analytics?
Optional, non-personalized advertising can help fund maintenance, and optional analytics helps identify broken or useful tools. Both are denied by default until you choose to accept optional services.
Who maintains EasyTool.me?
EasyTool.me is an independent project maintained by cieuly. You can read the project background or contact the maintainer by email.
One focused collection for everyday developer tasks
EasyTool.me is built around small jobs that should not require installing an app or pasting sensitive material into an unknown server. The core directory covers data formatting, encoding, dates, identifiers, text comparison, token inspection and local file operations.
Start with JSON formatting, Base64 encoding, regular expression testing, timestamp conversion or browse the full tools directory.