The Developer shelf

Developer tools.
Less setup.

Format data, compare text, prepare web assets, and turn PDFs into editable notes. Pick a task and get straight to work.

Browse all 10 tools

No account required. Nine tools work on your device; IP lookups use a server.

Find the right tool

What are you working on?

Ten real tools. Direct links.
No installation or dashboard to get through.

Documents & file checks

Reuse text, spot changes, or check that a file matches its source.

3 tools

Editable documents

PDF to Markdown Converter

Turn PDF text or English scans into editable Markdown. Review the original before copying or downloading.

On your deviceConvert a PDF

Text comparison

Text Diff Checker

Compare two texts or local files by line, word, or character, then export the changes.

On your deviceCompare text

File verification

File Checksum

Calculate a file’s checksum or compare several files with a publisher’s checksum list.

On your deviceCheck a file

Data & formatting

Make structured data easier to read, check, and reuse.

2 tools

JSON data

JSON Formatter & Validator

Format and check JSON, find errors, sort keys, or make a compact copy without changing number text.

On your deviceWork with JSON

Tables & records

CSV Workbench

Preview, sort, remove duplicate rows, repair, and convert CSV, TSV, or JSON data.

On your deviceOpen a table

Web assets & codes

Prepare sharp graphics, site icons, and scannable codes.

4 tools

Vector graphics

SVG Optimizer

Clean up SVG markup, check the preview, and download an optimized SVG or PNG.

On your deviceClean up an SVG

Website icons

Favicon Generator

Make an ICO file and PNG icons for browser tabs, touch shortcuts, and apps from one image.

On your deviceMake site icons

QR codes

QR Code Studio

Create a QR code or read a QR image locally without automatically opening its link.

On your deviceWork with QR codes

Barcodes

Barcode Generator

Create common barcode formats and download sharp SVG or PNG files for your labels.

On your deviceMake a barcode

Network information

Look up a public IP address with clear limits on what it can tell you.

1 tool

Public IP information

IP Address Lookup

Check approximate location, network details, VPN or Tor signals, and crawler verification.

Server-assistedLook up an IP

A few useful details

Small tools.
Clear boundaries.

No account, no installation

Open a tool and start with your text, data, or file. Each tool has its own controls and a direct way to copy, download, or use the result.

Local when the job allows it

The document, data, and graphics tools process your input in your browser. IP lookup needs a server, as labeled above. Opening the website still makes ordinary page requests and can generate analytics traffic.

Keep a copy of what matters

Download your result before closing a tool. Check important numbers, document structure, and code output before using them elsewhere.