masstree.in Home

All Tools

Every tool on masstree.in, free and private — search by what you need to do.

Runs in your browser — nothing is uploaded or stored on a server.

Lab tools

QC CalculatorLevey-Jennings charts with the full Westgard rule set, dated logs and printed reports Dilution CalculatorBuffers, serial dilutions and molarity for the bench BioLinguist assistantAsk, talk or drop a file — it works every tool on this site RoastBotThe assistant with no bedside manner

Everyday tools

Health CalculatorBMI, BMR, calories and macros for your goal Image CompressorShrink, crop and convert JPG, PNG, WebP PDF ToolsMerge, split, sign, compress, convert QR Code GeneratorLinks, Wi-Fi, vCard, UPI — with logo and colours Password GeneratorStrong passwords, passphrases, strength check Word CounterWords, characters, reading time — Hindi too

PDF tasks

Compress PDF to 200 KBFor forms that cap uploads at 200 KB Compress PDF to 100 KBThe strictest form limit, handled JPG to PDFPhotos into one tidy PDF PDF to JPGEvery page as a sharp image Merge PDFSeveral PDFs into one, in order PDF to WordEditable text from any PDF

Photo and image tasks

Compress image to 20 KBSignatures and small photos for forms Compress image to 50 KBApplication photos under 50 KB Passport size photo3.5 × 4.5 cm, under 50 KB HEIC to JPGiPhone photos that open everywhere JPG to WebPFaster website images

QR code tasks

Wi-Fi QR codeGuests scan once and connect UPI QR codeScan & Pay card for your counter

Text tasks

Instagram caption counterStay inside the 2,200 limit

Questions

Are these tools really free?

Yes — no sign-up, no watermark and no limits. They run in your browser, so there is nothing to pay for on a server.

Are my files uploaded?

No. PDFs, photos and text are processed on your own device. Only the assistant's typed questions, voice clips and e-mail breach checks are sent to a server, and those are not kept. The site does keep a simple visit log of page, time, IP address and browser, with no cookies.

Can I use them on my phone?

Yes, every tool works in Android and iPhone browsers, and you can install masstree.in as an app from the browser menu.