Edit a README or document
Write Markdown and review headings, tables and links in the preview. Export the reviewed version; use a diff against an older version to inspect additions and removals before updating the repository.
Developer Tools Write, Format & Check
Format JSON, encode Base64 and URLs, minify HTML/CSS/JS, generate hashes or compare files. Find the right task group and review the result before using it in a project.
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All tools
Search and filter 17 developer tools by task.
17 tools
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No matching tools. Try another name or function.
Online Code Editor
Write HTML, CSS and JavaScript, run a preview, inspect the console and download an HTML file.
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Online Markdown Editor
Write Markdown with a preview, manage files and export MD, HTML or a workspace backup.
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Online File Comparison
Compare text, code or text-layer PDFs using side-by-side and unified diffs.
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JSON Formatter
Format or compact JSON and find syntax errors before using the data in your project.
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Base64 Encoder Decoder
Encode UTF-8 text or images as Base64; decode data and choose URL-safe output when needed.
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URL Encoder Decoder
Encode or decode a component or whole URL; choose how to handle plus signs.
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Fake Data Generator
Choose fields and a record count, preview test data and export JSON, CSV or SQL.
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HTML Minifier
Paste HTML or choose a file, select minification options and copy or download the result.
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CSS JS Minifier
Compact CSS or JavaScript, review before/after sizes and download a file to test in your project.
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SVG to Code Converter
Prepare HTML, CSS and JSX snippets from SVG markup or a file for review before integration.
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Color Palette
Choose a palette, try gradients and text/background contrast, then export color code for your interface.
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Hash Generator
Hash text or a file, choose an algorithm and compare a reference checksum.
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Password Checker
Review a heuristic score, easy-to-guess patterns and suggestions, or generate a random password.
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TOTP Generator
Get a 2FA TOTP code from a registered secret and match the settings used by your service.
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Website Technology Checker
Review CMS, framework, server and theme signals from a public page, with detection evidence.
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Link Shortener
Create a short link from a public URL, then open it to check the destination.
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UUID Generator
Generate UUID v1, v4 or v7 in a batch, choose output formatting and validate an existing UUID.
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Choose a utility for each development step
This collection covers specific jobs: writing drafts, preparing data, compacting code and checking results. Match the input and output to your task, try a small sample and bring the reviewed result into your project.
What do you need to work on?
| Your task | Tool and action | Check before using the result |
|---|---|---|
| Draft docs, try a demo or compare versions | Markdown Editor Online Code Editor File Comparison Use Markdown for documents, HTML/CSS/JS for demos and a diff to inspect changes between two versions. |
Review the preview or console. PDF diffs compare extractable text, not page layouts or scanned images. |
| Prepare test data and identifiers | JSON Formatter Fake Data Generator UUID Generator Format JSON, choose fields for sample records or generate the UUID version you need. |
Check data types, field names and the receiving system’s requirements. Valid JSON syntax does not validate business rules. |
| Encode text or URL components | Base64 Encoder/Decoder URL Encoder/Decoder Use Base64 to represent data; choose URL component mode for a parameter value or whole-URL mode when appropriate. |
Decode the result and compare it with the original. Encoding and decoding do not protect confidential data. |
| Prepare interface code and colors | HTML Minifier CSS JavaScript Minifier SVG to Code Color Palette Choose the right code type or snippet format; try your palette against the intended text and background. |
Keep the original and test layout, interactions and contrast in your project before replacing a file. |
| Verify a file or work with account tools | Hash Generator Password Checker Get a 2FA TOTP Code Use the correct checksum algorithm, review password patterns or use a TOTP secret registered with your service. |
Hashes must match the reference file or text. Password scores do not check breaches; TOTP requires matching secrets, settings and device time. |
| Inspect a website or share a URL | Website Technology Checker Link Shortener Enter a public URL to inspect technology signals, or create a short link and test it. |
Read detection evidence and the final URL. Technology detection cannot inspect all server-side source code. |
Connect tools around your project’s output
Prepare samples for an API or form
Choose fields and a record count to generate test data. Export JSON and format it to review field names and types. Test the sample in your project’s test environment; avoid treating generated contacts as real customer data.
Try a web interface component
Write HTML/CSS/JS and inspect the preview and console at the intended size. Once it works, try compacting the code, compare it with the original and test interactions in your project before deploying.
When the result is not what you expected
- JSON reports a syntax error
- Check brackets, trailing commas and double quotes around property names. Make sure you pasted JSON rather than a JavaScript object with comments. Reformat after fixing it and compare important values.
- Smaller code behaves or displays differently
- Return to the original, inspect the diff and check meaningful whitespace, comments or characters. Try individual files and options on a small sample, then use your project’s build and tests before replacing the running version.
- Decoded Base64 is not readable text
- Identify whether the original is UTF-8 text or an image. Images need image mode; valid Base64 may still contain bytes that are not text. Check the source and mode instead of repeatedly encoding the string.
- An SVG snippet does not work in your project yet
- Choose HTML, CSS or JSX for the integration point. Review attributes, styles, IDs and resource references, then test in your project. The conversion produces a snippet for review, not a complete React application.
- A CMS or backend is not identified
- Check the final URL and the public evidence the tool could read. A website may hide signals or serve a different page to server requests. Missing a technology is not enough to conclude it is absent.
Check processing details before entering data
Formatting, encoding/decoding, minification, file comparisons and hashing in this collection process content in the browser. Some tools keep drafts or history in browser storage; export a backup before clearing data or changing devices.
Creating Code/Markdown share links sends a content snapshot to the server. Link Shortener sends the URL for storage, while technology checks send it to fetch a page. Code or external preview resources may also make network connections. Review content before sharing and keep tokens, passwords and 2FA secrets out of public documents and links.
FAQ
Frequently asked questions about Developer Tools
What to know when choosing a utility and using its results in development.
Need more help?
Send the tool name and describe the issue; only include samples with private data removed.
Contact usAre these developer tools free?
Yes. KitoTool tools are free to use. File, record-count and server-request limits vary by tool; read the input notice before starting.
Can I process many files or large datasets at once?
It depends on the tool. UUID and test-data generators offer a count setting; file comparison needs two versions. Check the page’s limits for large inputs and try a small sample first; batch processing is not universal.
Can I use these tools on a phone?
The directory provides search and filters on small screens. Use file-picker buttons or enter data in each tool; content tables can scroll sideways. A larger screen is more convenient for long code, multiple files or comparing two versions.
Do these utilities replace an IDE and build workflow?
They help with specific tasks and small experiments. The code editor runs HTML/CSS/JavaScript in a preview; backend compilation, dependency management and full-project testing remain part of your development environment.
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