Developer Tools

Format converters and encoders that never send your data to a server, so you can paste production payloads safely.

17 free tools Nothing uploaded No sign-up
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Developer Tools

Pick the exact conversion you need. Every tool opens ready to use.

JSON to CSV

Flatten nested JSON into a spreadsheet ready CSV.

CSV to JSON

Turn a CSV file into typed JSON records.

JSON to XML

Convert JSON documents into valid XML.

XML to JSON

Parse XML into clean, readable JSON.

JSON Formatter

Pretty print, minify and validate JSON.

YAML to JSON

Convert YAML config files into JSON.

JSON to YAML

Convert JSON into readable YAML.

Base64 Encoder

Encode and decode text or files as Base64.

URL Encoder

Percent encode and decode URLs and query strings.

HTML Entity Encoder

Escape and unescape HTML entities safely.

Color Picker

Pick a colour out of any image and copy its code.

HEX to RGB

Convert colour codes between HEX, RGB and HSL.

RGB to HEX

Convert RGB values into a HEX colour code.

Unix Timestamp

Convert between Unix time and a readable date.

Number Base

Convert between binary, octal, decimal and hex.

MD5 Hash

Generate an MD5 checksum from text or a file.

SHA-256 Hash

Generate a SHA-256 hash from text or a file.
FAQ

Questions about these tools

What people ask before they run their first conversion.

Yes. Every tool on this page is free with no daily limit, no watermark and no account. There is no paid tier holding back a setting you need.

No. These tools run inside your browser, so your file is read from your device, processed in memory and handed straight back to you as a download.

The practical limit is your device memory rather than a server rule. Most phones handle files well over 100 MB and desktops handle far more.

Most tools accept several files at once and let you download the whole batch together, and adding files does not put you in a longer queue.

Only where the output format is lossy. Converting to PNG keeps every pixel, while JPG and WebP use lossy compression, which we run at a high setting you would struggle to tell from the original.

Yes. Every page is built mobile first and tested on low end Android devices as well as iPhones, and you can pick files straight from your gallery.

No. There is no app, no extension and no plugin. The page you are on is the whole tool.

No, because we never receive one. There is nothing on our side to store, scan or delete later.

Any current version of Chrome, Edge, Firefox, Safari, Samsung Internet or Opera, on desktop and mobile.

Email info@tools.kishanrajyaguru.com with the exact conversion you need. Requests are the main thing that decides what we build next.

Safe to use with real data

Most online JSON and Base64 tools post whatever you paste to a server. That is fine for a toy example and a genuine problem when the payload is a production response with customer records inside it.

Everything on this page runs in your browser. The parsing, the conversion and the formatting all happen in memory on your machine, which means you can paste a real API response, a customer export or an internal config file without it leaving your laptop.

The tools are also strict about correctness. JSON is validated before conversion and errors point at the exact line, CSV handles quoted fields and embedded commas properly, and hashes are computed with the browser's native crypto implementation rather than a hand rolled script.

A developer working with JSON and CSV data on screen
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Other categories

The rest of the toolbox, grouped the way you would look for it.

Image Converters

Convert between every common image format directly in your browser. Nothing is uploaded, so even a large batch finishes in seconds.

26 tools

Image Compression

Reach an exact upload limit on the first attempt. Give us a target in KB and we find the highest quality that still fits under it.

14 tools

PDF Tools

Turn your images into one PDF without sending them anywhere. Choose the order, the page size and the margin.

9 tools

Unit Converters

Type a number and read the answer. Every converter shows the formula and a full reference chart underneath.

32 tools

Text Tools

Small text jobs that would otherwise need a script. Everything updates as you type.

13 tools

Currency and Finance

Live mid-market rates, a clean history chart and no adverts covering the number you came for.

8 tools

Cannot find the tool you need?

Tell us the conversion and we will build it. Every tool here started as a request.

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