filemarkr
All ToolsGuides
filemarkr

60+ free developer tools that run entirely in your browser — JSON formatter, JWT decoder, Base64, diff checker, regex tester, hash generator and more. No upload, no sign-up, completely private.

JSON & Data

  • JSON Formatter
  • JSON Minifier
  • JSON Validator
  • JSON to CSV
  • CSV to JSON
  • JSON to YAML

Encode & Decode

  • Base64 Encode / Decode
  • Base64 to Image
  • Image to Base64
  • URL Encode / Decode
  • HTML Entity Encoder
  • JWT Decoder

Text Tools

  • Text Diff Checker
  • Case Converter
  • Word & Character Counter
  • Slug Generator
  • Remove Duplicate Lines
  • Sort Text Lines

Generators

  • UUID Generator
  • Password Generator
  • Lorem Ipsum Generator
  • QR Code Generator
  • Random Number Generator
  • NanoID Generator

Popular Guides

  • How to Format and Pretty-Print JSON (Without Breaking It)
  • How to Minify JSON and Shrink Your API Payloads
  • How to Validate JSON and Pinpoint the Exact Syntax Error
  • How to Convert JSON to CSV for Excel and Google Sheets
  • How to Convert CSV to JSON (With Proper Header Detection)
  • All guides →

Explore

  • All Tools
  • JSON Formatter
  • JWT Decoder
  • Diff Checker
  • UUID Generator

Company

  • About
  • Privacy
  • Terms
  • Sitemap

Our Promise

  • 100% in your browser
  • Zero uploads
  • No sign-up, always free

© 2026 filemarkr. Designed & developed by Naved Naik.  All processing happens locally in your browser.

All tools

QR Code Generator

Create a downloadable QR code from any link or text, right in the browser.

100% private Instant, in-browser Read the guide
Loading the tool…

Create a QR Code From Any Link or Text

This QR code generator turns any URL or piece of text into a scannable QR code you can download and use anywhere. Paste a link, a Wi-Fi string, a phone number, or plain text, and the code renders instantly so you can drop it into a slide, poster, packaging design, README, or business card. It is a fast way to bridge print and physical materials to a digital destination without signing up for a marketing service.

How it works

The QR code is generated entirely in your browser with JavaScript. Your input is encoded locally and drawn to an image on your machine, so the link or text you encode is never uploaded to a server. Once the code appears, you can download it as an image file and scan it with any phone camera to confirm it points where you expect. The code is static, meaning your data is baked directly into the pattern rather than routed through a redirect, so it keeps working with no tracking, no expiry, and no account behind it.

Practical use cases

  • Link a printed flyer, poster, or sticker to a landing page
  • Share a URL or app link on a slide during a talk
  • Encode Wi-Fi details or contact info for quick scanning
  • Add a scannable link to product packaging or a README

For related sharing and web tasks, tidy your links with the URL Parser, encode query strings using URL Encode / Decode, or generate page metadata with the Meta Tag Generator.

Because the code is built in-browser, the data you encode is never transmitted, logged, or stored, which matters for private links. The tool is free, requires no account, and works across modern browsers, including mobile.

Frequently asked questions

Any text works, including URLs, Wi-Fi credentials, phone numbers, email addresses, or plain notes, and it is encoded exactly as you enter it.

Related tools

UUID Generator

Generate v4 and v1 UUIDs in bulk, ready to copy or download.

Password Generator

Create strong, random passwords with full control and a strength meter.

Lorem Ipsum Generator

Generate placeholder paragraphs, sentences or words for mockups.

Random Number Generator

Generate random numbers in any range, with unique and sorted options.