Free calculators, image & PDF tools

56 tools you can use right now. No sign-up, no watermark, and most of them never upload your files.

Popular

Shrink photos to 100KB, 200KB, 500KB or any size

Make PDFs small enough for email and upload limits

Loan Calculator

Monthly payment and total interest, 3 repayment types

Turn a PDF into an editable DOCX file

Passport & ID Photo Maker

Crop to passport/ID size, white background, 4×6 print sheet

Percentage Calculator

X% of Y, percent change, discounts

Calculators (19)

Loan Calculator

Monthly payment and total interest, 3 repayment types

Compound Interest Calculator

Growth with monthly contributions, rule of 72

Savings Interest Calculator

Deposit and monthly savings plan interest

Currency Converter

Live exchange rates with card or bank fees

VAT & Sales Tax Calculator

Add or remove tax at any rate

Profit Margin Calculator

Margin vs markup and target selling price

Stock Profit Calculator

Return after broker fees and taxes

Average Cost Calculator

Average down and shares needed

Percentage Calculator

X% of Y, percent change, discounts

Exact age in years, months and days

Date Calculator

Days between dates, add days, weekdays

Days Until Countdown

Countdown, 100 days and anniversaries

Length, weight, area, temperature, volume, data

4.0 scale with letter grades and credits

WHO categories, metric or US units

Calorie Calculator

BMR and daily calories by activity

Sleep Calculator

Bedtime and wake time by 90-minute cycles

Ovulation Calculator

Fertile window and ovulation date

Due Date Calculator

Pregnancy week and due date

Image tools (18)

Shrink photos to 100KB, 200KB, 500KB or any size

Resize by pixels, percent or social media presets

Enlarge small photos 2–4x with sharp edges

Passport & ID Photo Maker

Crop to passport/ID size, white background, 4×6 print sheet

Crop to 1:1, 4:5, 16:9 or a custom area

Rotate & Flip Image

Rotate 90° and mirror photos

Brightness, filters, text and borders

Join photos side by side, stacked or in a grid

Remove Background

Erase the background from portraits automatically

iPhone HEIC, PNG, WEBP to JPG

Convert from JPG

JPG to PNG, WEBP or animated GIF

Image to Text (OCR)

Copy text from photos and screenshots

Favicon Generator

favicon.ico and app icons from a logo or letters

Full Page Screenshot

Capture a whole web page from its URL

Text or logo watermark on many photos at once

Find and blur faces and license plates

Top and bottom text on your own photo

AI Image Checker

Check C2PA and metadata for AI-generated images

PDF tools (10)

Word, Excel, PowerPoint, TXT (and HWP) to PDF

Make PDFs small enough for email and upload limits

Turn a PDF into an editable DOCX file

Combine PDFs in the order you want

Extract page ranges or split every page

Organize PDF Pages

Reorder, rotate and delete pages

Many photos into one PDF (A4 or Letter)

Save each PDF page as JPG or PNG

Place a drawn signature or stamp image

Extract text from a PDF and save as TXT

Everyday & text tools (9)

QR Code Generator

Links, Wi-Fi and contact QR codes

YouTube Thumbnail Downloader

Save a video thumbnail in HD

Alarm timer, Pomodoro, full screen

1/100 second stopwatch with laps

Time Zone Converter

World clock and meeting planner

Random Team Generator

Split names into random groups

Random Number Generator

Draws, dice and coin flips

Words, characters, reading time

Highlight differences between two texts

Private by design

CalcLab tools use the processing power already inside your browser. When you compress a photo or merge a PDF, the file is read and saved on your own device, which is faster and keeps personal documents private. The few tools that need a server say so clearly on the page.

Frequently asked questions

Is CalcLab really free?

Yes. All tools are free with no sign-up, no watermark and no trial period.

Where are my files processed?

All calculators and most image and PDF tools run entirely in your browser, so your files never leave your device. Word to PDF, Compress PDF, PDF to Word and Full Page Screenshot use our server; files are deleted right after processing.

Does it work on phones?

Yes. Every tool works in a modern mobile browser on iPhone and Android.