All the tools you need, in one place.
Convert files, generate barcodes, format data and calculate business costs — directly in your browser.
141 tools, all free. Most never send your data anywhere. Signed out: 2 uses a day — sign up free for 100/day.
Popular Tools
Popular tools
The pages people come back to most.
ZPL Viewer
Paste Zebra ZPL code and see the rendered label instantly.
Barcode Generator
Create Code 128, Code 39, EAN, UPC-A, ITF and Codabar barcodes as PNG or SVG.
QR Code Generator
Build QR codes for text, links, email, phone numbers and Wi-Fi networks.
JSON Formatter
Pretty-print or minify JSON, with the exact position of any syntax error.
Base64 Encoder / Decoder
Encode and decode Base64 text or files, including data URLs.
CSV to JSON
Convert a CSV file or pasted rows into a JSON array.
Volumetric Weight Calculator
Work out dimensional shipping weight from width, length and height.
Marketplace Profit Calculator
See what is left after commission, shipping, packaging and VAT.
VAT Calculator
Add VAT to a net price or strip it out of a gross price.
JWT Decoder
Decode and inspect JWT header, payload and signature without a secret.
Hash Generator
Generate SHA-1, SHA-256, SHA-384 and SHA-512 hashes from any text.
Password Generator
Generate strong, cryptographically random passwords with custom rules.
YAML ↔ JSON Converter
Convert YAML to JSON or JSON to YAML instantly, right in your browser.
Merge PDF
Combine several PDF files into one, in the order you choose.
Compress PDF
Reduce PDF file size in your browser with a quality level you choose.
PDF to JPG
Convert each page of a PDF into a high-quality JPG image.
Watermark PDF
Stamp a text watermark across every page of a PDF, tiled or centered, with adjustable opacity and rotation.
Color Contrast Checker
Check whether a text and background color pair meets WCAG AA or AAA contrast.
Favicon Generator
Turn one image into every favicon size a site needs, with the ready-to-paste HTML.
Meta Tag Generator
Generate title, description, Open Graph and Twitter Card meta tags, ready to paste into <head>.
Audio Trimmer
Cut an audio file down to the exact start and end time you need, and download it as WAV.
Excel ↔ CSV / JSON Converter
Export an Excel sheet as CSV or JSON, or build a new .xlsx file from CSV or JSON data.
JSON to Model Class
Generate C#, Java or Python model classes from a JSON sample.
cURL to Code
Turn a cURL command into JavaScript Fetch, C# HttpClient or Python Requests code.
Visual Label Designer
Design a shipping or product label with text, barcodes, a logo and boxes, and export it as ZPL.
Image to Text (OCR)
Extract editable text from a photo or screenshot in English or Turkish, entirely in your browser.
Simple Process
How It Works
No tutorials, no onboarding. Just open a tool and get to work.
Choose a Tool
Browse our library of 50+ professional tools, organized by category.
Do Your Work
Use any tool instantly — no signup required, no software to install.
Done!
Download, copy or share your results. Your data never leaves your browser.
Free to use
No credit card needed. Signed out you get 2 uses a day; a free account raises that to 100/day.
Browse by Category
Browse by category
Five focused collections instead of one endless list.
Barcode & Label Tools
Render Zebra ZPL labels, export them as PNG or PDF and generate retail-ready barcodes and QR codes.
12 tools →
Developer Tools
Format and validate JSON, encode Base64 and URLs, convert Unix timestamps and generate UUIDs — all inside your browser.
46 tools →
File Conversion Tools
Move data between JSON, XML and CSV without uploading anything to a server.
11 tools →
PDF Tools
Merge, split, rotate, compress and convert PDF files — every operation runs in your browser, so your documents never leave your device.
15 tools →
Image Tools
Compress, resize, crop, convert and watermark images between JPG, PNG and WebP — every operation runs in your browser, so your images never leave your device.
16 tools →
E-Commerce Tools
Work out volumetric shipping weight and marketplace profitability before you list a product.
6 tools →
Business Calculators
VAT, discount and margin maths done right, with the formulas spelled out.
8 tools →
Text Tools
Count words, convert letter case, generate slugs, reverse text and create Lorem Ipsum — all in your browser.
8 tools →
SEO Tools
Generate meta tags, robots.txt and schema markup, then check keyword density and readability — everything runs in your browser.
14 tools →
Audio Tools
Trim and convert audio files entirely in your browser — nothing is uploaded to a server.
5 tools →
New Additions
Recently added
The newest additions to the catalogue.
Audio Converter
Convert MP3, OGG, M4A and other audio formats your browser can play to WAV.
Audio Joiner
Combine several audio files into one, in the order you choose, and download it as WAV.
Audio Trimmer
Cut an audio file down to the exact start and end time you need, and download it as WAV.
Barcode Reader
Read Code 128, Code 39, EAN, UPC, Data Matrix, PDF417 and other barcodes from an uploaded image.
Base32 Encoder / Decoder
Encode text to RFC 4648 Base32 or decode it back, the format behind TOTP secrets.
Base64 to Image
Paste a Base64 string or data URL and decode it back into a downloadable image.
What you can do here
Utilerio is a focused collection of utilities for four jobs that keep coming up in day-to-day work: reading and fixing structured data, producing barcodes and labels, moving files between formats, and doing the commercial arithmetic behind an online order.
The barcode and label section covers Zebra's ZPL language end to end. You can paste ZPL and see the rendered label, export the same code as a print-ready PDF, or save it as a PNG for a ticket or a supplier email. Alongside that sit a barcode generator with per-symbology validation and a QR code generator that handles Wi-Fi credentials and contact links, not just plain text.
The developer and file-conversion sections handle JSON, XML and CSV. Formatting, validation and conversion all happen inside the browser tab, which means a production payload you are debugging never leaves your machine. Errors are reported with the line and column where the parser gave up, so you can fix the document instead of guessing.
The calculators cover the numbers behind selling something: VAT in both directions, single and stacked discounts, the difference between margin and markup, volumetric shipping weight, and what is actually left after a marketplace takes its commission.
FAQ