Free browser tools by NelcByte
Free online tools. No account. No install.
Compress images without uploading them, check DNS and format JSON. Most processing stays on your device.
Built and hosted by NelcByte. Most inputs stay on your device.
The toolbox
Pick a tool. Finish the job.
Each tool is a single page with a clear input and a useful result.
Image Compressor
Shrink JPEG, PNG and WebP images in your browser without uploading them.
Open toolQR Code Generator
Turn a URL or short text into a downloadable QR code PNG.
Open toolDNS Checker
Look up A, AAAA, CNAME, TXT, MX, NS and SOA records for any domain.
Open toolJSON Formatter
Format, validate and minify JSON with clear line and column errors.
Open toolPassword Generator
Create random passwords with the browser's cryptographic random generator.
Open toolUUID Generator
Generate one or many random UUID v4 values and copy the list.
Open toolBase64 Encoder
Convert UTF-8 text to Base64 and back, including URL-safe output.
Open toolWord Counter
Count words, characters, sentences and paragraphs as you type.
Open toolAge Calculator
Find an exact age in years, months and days, plus the next birthday.
Open toolBMI Calculator
Calculate BMI in metric or imperial units and see a healthy range.
Open toolMost processing stays on your device
Most of these tools send nothing to a server. Formatting, encoding, image compression, generating and calculating happen in your browser. The DNS Checker is the exception: it sends the domain and record type directly to Cloudflare's public DNS service. NelcByte does not receive the query. Read the privacy policy.
How it works
Three steps, then you are done
Choose a tool
Open the utility that matches your task, or search the full list.
Enter your input
Paste JSON, type text, pick a date or set the options you need.
Copy the result
Use the copy or download button. Most tools never send your input anywhere.
From the blog
Notes worth reading
Short, practical articles about the things these tools deal with.
How to Speed Up Your Website: A Practical Checklist
A no-nonsense order of operations for faster pages: measure first, then fix images, fonts, JavaScript, caching and hosting.
Read articleHow to Validate JSON Online (and Fix Common Errors)
Trailing commas, single quotes and comments are not valid JSON. Learn how to read parser errors and fix them quickly.
Read articleWhat Makes a Strong Password?
Length and randomness matter more than clever substitutions. A practical guide to passwords, passphrases and password managers.
Read articleQuestions
Before you start
Are the tools really free?
Yes. Every tool on NelcByte Tools is free to use. There is no account, no trial and no paid tier.
Do you store what I paste into a tool?
No. Most tools run as JavaScript in your browser, and your input is not sent to NelcByte. The DNS Checker sends the domain and record type directly to Cloudflare's public DNS service; NelcByte does not receive that query. If you email us, we receive whatever you choose to include in that email.
Which tools contact a third party?
Only the DNS Checker. It asks Cloudflare's DNS-over-HTTPS service for the records you request, so Cloudflare receives the domain, record type and standard request information such as your IP address. The image compressor and every other tool work locally.
Do I need an account?
No. Open the page and use the tool. There is nothing to sign up for.
Can I use the results in my own work?
Yes. The results are yours to use. For important work, check the output yourself, especially for dates, health figures and anything you plan to publish.
Why do some tools need JavaScript?
The processing happens in your browser, so JavaScript is what makes the tool work. The pages themselves still load without it, but the interactive tools will not run.