UA

Developer Tools

Converters, encoders, generators and testers for everyday coding. Everything runs locally in your browser.

Data converters

JSONJSON to YAMLPaste JSON and get clean, readable YAML instantly. Upload a .json file or download the result as .yaml.YAMLYAML to JSONPaste YAML and get valid JSON instantly, pretty-printed or minified. Upload a .yml file or download the result.JSONJSON to CSVTurn a JSON array into a CSV table for Excel or Google Sheets. Nested fields become their own columns.CSVCSV to JSONPaste CSV or upload a file and get a clean JSON array. The header row becomes the keys.

Encoding

B64Base64 DecodePaste Base64 and read the decoded text instantly, or download the decoded file. URL-safe Base64 works too.B64Base64 EncodeEncode text or any file to Base64 in one step, with URL-safe and data URI options.IMGImage to Base64Drop an image and copy it as a Base64 data URI, ready for HTML, CSS, JSON or email templates.B64Base64 to ImagePaste a Base64 string or data URI, see the image instantly and download it with the right file extension.

Image inspection

AIAI Image CheckerSee whether an image says it was made or edited with AI. The checker reads Content Credentials and AI labels hidden in the file.EXIFImage Metadata ViewerSee all the hidden data in a photo: camera, lens, settings, date, GPS location, editing software and AI labels.EXIFRemove Metadata from PhotoStrip EXIF data, GPS location and other hidden information from your photos before you share them. Batch, no quality loss.

Generators

IDUUID GeneratorGenerate random UUIDs in bulk, copy them in the exact format your code needs and check any UUID’s version.

Testers

.*Regex TesterTest a regular expression against your text and see every match, group and replacement as you type.

These tools cover the small jobs that interrupt real work: turning a JSON response into YAML for a config, opening an API export in Excel, decoding a Base64 value from a log, generating test IDs or checking a regular expression before it ships.

Like every formatmath tool, they run entirely in your browser. Tokens, secrets, customer data and source code you paste here are processed on your device and never sent to a server.

Frequently asked questions

Are these developer tools free?

Yes. Every tool is free, has no usage limit and needs no account.

Is it safe to paste API keys, tokens or customer data?

The tools run entirely in your browser, so the data you paste is processed on your device and never uploaded. As with any website, clear sensitive data from the page when you are done.

Do the tools work offline?

Once a page has loaded, the tool keeps working without an internet connection, because all processing happens locally.

Latest guides and news

CR2JPGCANON RAWRAW
Formats explained

What Is a CR2 File? Canon RAW Explained and How to Open It

A CR2 file is Canon's RAW photo format. See which cameras shoot CR2, how to open it on Windows, Mac, Photoshop and phones, and why it may not open.

· 6 min read

CR3JPGCR2RAW
Formats explained

What Is a CR3 File? How to Open It on Windows, Mac and Phone

A CR3 file is Canon's RAW photo format. Learn what is inside it, how it differs from CR2, and how to open CR3 files on Windows, Mac, iPhone and Android.

· 6 min read

PSDJPGPNGIMG
Guides

How to Open a PSD File Without Photoshop

Ways to view, convert and edit PSD files for free, and why some PSDs show a blank or wrong preview outside Photoshop.

· 2 min read

We made this tooFree fee and profit calculators for Etsy, eBay and Amazon sellers.fee-math.com →