Combining materials from many sources
Lesson plans, worksheets, and reference sheets often come from many different PDFs and need to be combined into a single handout.
For Educators
Free PDF tools for educators — worksheets, lesson plans, and answer keys
Build clean, classroom-ready PDFs without a budget for a paid editor. Combine materials, number worksheets, watermark answer keys, and protect grade sheets. Everything happens in your browser, so student work and answer keys stay on your device.
Differentiating answer keys from student copies
Teachers need a way to clearly mark and protect answer keys so they don't end up in the wrong hands.
Page numbering across many worksheets
Manually numbering every page of a packet is tedious. A fast, reliable page-numbering tool is a huge time-saver.
Recommended PdfPix tools
Merge PDF
Combine lesson plans, worksheets, and references into one printable handout.
Open tool →Add Page Numbers
Number every page of a worksheet packet or exam automatically.
Open tool →Add Watermark
Stamp answer keys with a clear 'Answer Key' watermark and optional draft markers.
Open tool →Protect PDF
Password-protect grade sheets and answer keys before sharing them with colleagues.
Open tool →Image to PDF
Convert scanned or photographed student work into clean PDFs for digital records.
Open tool →Scan to PDF
Use your phone camera to scan paper worksheets and turn them into shareable PDFs.
Open tool →Suggested workflow
- 1
Build the handout
Drop the lesson plan, worksheets, and references into Merge PDF and arrange them in the order you teach.
- 2
Number the pages
Run the combined PDF through Add Page Numbers so every page is easy to reference during the lesson.
- 3
Mark the answer key
Apply an 'Answer Key' watermark to the master copy so it cannot be confused with the student version.
- 4
Convert paper to digital
If you have paper worksheets or student work to digitize, use Scan to PDF or Image to PDF to capture them cleanly.
Frequently asked questions
Is PdfPix free for teachers?
Yes. PdfPix is free for educators with no plan, no signup, and no usage limit. It is built for classroom use.
Can I protect answer keys with a password?
Yes. Add the watermark, then run the file through Protect PDF to add a password before sharing the file with colleagues.
Does PdfPix work on school iPads and Chromebooks?
Yes. PdfPix runs in any modern browser, including Safari on iPadOS and Chrome on ChromeOS, and requires no installation.
Can I add a custom watermark with the school name?
Yes. The Add Watermark tool lets you choose text or image, font, size, opacity, rotation, and position. You can also use the same image watermark for your school logo.