25 Free Online Tools Every Student Should Bookmark (2026)

Being a student means living in a world of PDFs, word limits, group projects, and "please compress this to under 5 MB." It also means being broke. The worst part: most "free" online tools are actually free trials — they watermark your PDF, cap your file size, or quietly upload your essay to a server you don't control.

I run Tooly, a collection of 57+ free browser tools, and I put together a list of the 25 that actually earn a spot in a student's bookmark bar. Every one runs entirely in your browser — no signup, no watermark, no daily limit, no uploading your files anywhere.

The 10 every student should bookmark

1. PDF Merger — Combine lecture slides, research PDFs, or essay chapters into one file. Runs fully client-side: no upload, no watermark, no page limit.
2. PDF Compressor — Submission portals love a 2 MB cap. Shrink a scanned 15 MB PDF down to size in seconds without blurry pages.
3. Word Counter — Paste your draft, watch words, characters, and reading time update live. Includes the characters-without-spaces count some portals use.
4. Case Converter — Title Case for essay headings, UPPERCASE for that one professor's formatting rules, sentence case for abstracts. One click.
5. QR Code Generator — QR codes for group-project posters, CVs, or portfolios. Free, custom colors, no tracking.
6. Image Compressor — That 8 MB phone photo becomes 300 KB, visually identical. Nothing leaves your device — matters when it's a passport scan.
7. Unit Converter — kg↔lb, km↔miles, °C↔°F, liters↔gallons. Rescue for physics homework and study-abroad packing.
8. Discount Calculator — "30% off everything" — what does that actually cost? Know before you check out.
9. Password Generator — Strong, unique passwords for every student account (LMS, library, email). Stop reusing passwords.
10. Lorem Ipsum Generator — Mock up report layouts, posters, or websites at 3 AM without waiting for real text.

Why "no signup" and "no upload" matter for students

Three reasons, in order of importance:

• Privacy. That essay isn't done, and it's not going on a stranger's server. Client-side processing means your files never leave your machine.
• No account debt. You don't need a tenth account with a tenth password for a tool you'll use four times a semester.
• No watermark ransom. The "free" PDF tools that watermark your name on page one of your thesis are the real cost. Genuinely free tools don't hold your output hostage.

The full list (25 tools, grouped by use case — including the CS/engineering section) is in the blog post: 25 Free Online Tools for Students (2026). Bookmark it before the semester starts.

I'm the founder of Tooly — 57+ free online tools, no signup, files stay in your browser. Premium apps (BankToCSV, SignForge, InvoiceForge) are for businesses that need them; the free tools stay free.