Free tools that work right in your browser
Merge PDFs, compress images, run the numbers and tidy up text. Your files stay on your device, so nothing is uploaded.
0 files uploaded by our tools. Everything runs on your device.
Works with
- JPG
- PNG
- WebP
- PSD
- MP4
- MP3
- JSON
Our most-used tools
Why people choose Toolkit Lab
Private by design
Files are processed in your browser and never uploaded to us.
Free, no sign-up
Use every tool without creating an account or paying.
Fast to start
Open a tool and start working. Nothing to install.
Works on any device
Use the same tools on a laptop, tablet or phone.
How it works
- 1
Pick a tool
Choose from PDF, image, text, calculator and developer tools.
- 2
Add your file or numbers
Choose a file from your device, or type your values.
- 3
Download the result
Save the output straight to your device.
All tools
PDF tools
5 toolsMerge PDF
Combine several PDF files into one, in the order you choose.
Split PDF
Pull selected pages out of a PDF into a new file.
Rotate PDF
Turn every page of a PDF by 90, 180 or 270 degrees.
JPG and PNG to PDF
Put photos or scans into one PDF, one image per page.
PDF to JPG
Save each page of a PDF as a JPG image.
Images and media
9 toolsImage Compressor
Shrink JPEG, PNG and WebP files and convert between formats.
PSD to PNG / JPG
Convert Photoshop files to PNG or JPG. Your file stays on your device.
Image Resizer
Resize photos by pixels, keep the aspect ratio, or aim for a target file size in KB.
Image Converter
Convert between JPG, PNG and WebP, with quality control and transparency kept.
Image to Base64
Turn a small image into a data URI for HTML or CSS. Nothing is uploaded.
CSV to JSON Converter
Turn spreadsheet CSV text, with a header row, into JSON objects.
Markdown Preview
Write Markdown and see headings, lists and links formatted as you type.
Password Strength Checker
Estimate how strong a password is. It is checked in your browser and never sent.
Video to MP3
Extract the audio from a video you own and save it as MP3.
Calculators
11 toolsLoan EMI Calculator
See the monthly payment and total interest on a loan.
Compound Interest Calculator
See how savings grow over time with interest added, and how much is interest.
Tip Calculator
Work out the tip, the total and each person's share of a bill.
SIP Calculator
See how a fixed monthly investment could grow at an assumed yearly return.
GST Calculator
Add GST to a price, or remove it from a total that already includes it.
BMI Calculator
Work out your Body Mass Index in metric or imperial units.
Percentage Calculator
Find percentages, what share a number is, and percentage change.
Date Calculator
Count the days between two dates, or add and subtract days.
Age Calculator
Work out your exact age in years, months and days, and days to your next birthday.
Discount Calculator
Work out the sale price, the saving and the total with sales tax.
Unit Converter
Convert length, weight and temperature between metric and imperial units.
Text and developer tools
18 toolsText Diff Checker
Compare two texts and see which lines were added, removed or unchanged.
Word Counter
Words, characters, sentences and estimated reading time, live.
Case Converter
Switch text to UPPERCASE, Title Case, camelCase, snake_case and more.
JSON Formatter
Beautify, minify and validate JSON with clear error messages.
Base64 Encoder
Encode text to Base64 and decode it back, with full UTF-8 support.
Lorem Ipsum Generator
Placeholder text in paragraphs, sentences or words for mockups.
Hash Generator
Calculate SHA-256, SHA-512 and other hashes for text or files.
Password Generator
Create strong random passwords. Generated on your device, never stored.
QR Code Generator
Turn a link or text into a QR code and download it as a PNG.
Color Converter
Switch between HEX, RGB and HSL with a live color preview.
Random Number Generator
Pick random numbers in any range, with or without repeats.
URL Encoder and Decoder
Percent-encode text for web addresses, or decode it back.
Unix Timestamp Converter
Convert epoch seconds to a date, or a date to a timestamp.
URL Slug Generator
Turn a title into a clean lowercase slug for a web address.
Roman Numeral Converter
Convert numbers 1 to 3999 to Roman numerals, and back.
Regex Tester
Test a regular expression on sample text and see each match highlighted.
Typing Speed Test
Measure your words per minute and accuracy in a short passage.
Online Stopwatch
Start, pause and record laps. Space and L keys work too.
No tools or guides match that search. Try “image” or “password”.
Questions, answered
Quick answers about how Toolkit Lab works. More detail is in our guides.
Are my files uploaded anywhere?
No. The tools run in your browser, so your files and text stay on your device. The only data our pages load comes from public libraries such as PDF and image engines.
Do I need an account?
No. You can use every tool without signing up.
Is it free?
Yes. All tools are free to use.
Why does Video to MP3 take a while the first time?
The converter engine is large, about 30 MB. It downloads the first time you convert, then conversions are faster.
Does it work on a phone?
Yes. Every page is designed to work on phones, tablets and desktops.
Ready when you are
Pick a tool and get your result in seconds.