PDFLab — Click-to-Edit PDF Editor (HTML + Python · PyMuPDF)
Freev1.0.0Click any line of a PDF, retype it, and export a file that keeps the document's own typography — plus a full markup toolbar.
PDFLab — Click-to-Edit PDF Editor (HTML + Python · PyMuPDF)
PDFLab v1.0.0.zip · 3 MB
Free forever · MIT license · Personal license key
Full pageOverview
PDFLab turns a browser tab into a working PDF editor: click any line of text in
the document, type over it, and export a file that keeps the original
typography. The trick is that **nothing is edited in the browser** — the page on
screen is a preview drawn *over* the PDF, and on export the coordinates travel
to a Python backend, which finds the original glyphs under them, deletes them,
and writes the replacement on the same baseline.
Fidelity is the whole point. A replacement inherits the **font, weight, slant,
size and colour of the run it replaces**: the document's own embedded face is
reused whenever it can be embedded and can render the new characters
(`font_source: exact`), otherwise the closest installed family comes in, then a
base-14 approximation — and the report says which one happened, every time.
Because the ink colour comes from the backend's reading of the span rather than
a sampled pixel, the preview and the export agree by construction, and so does
the geometry.
On top of text editing sits a full **markup toolbar**: freehand ink, highlighter,
arrows, rectangles, ellipses, text boxes and images, each with colour, stroke
width, opacity and fill — plus font, size, weight, alignment and italic for text.
The highlighter snaps to the glyph boxes under the sweep instead of drawing a
thin rectangle, and an arrow's filled head is computed in PDF points, so what you
see and what you ship cannot drift apart.
It is deliberately small: **one HTML page and one Python backend** — no build
step, no npm, no database. `pip install -r requirements.txt`, run uvicorn, open
the page. Use it as an internal redaction tool, embed it as the document step of
your own product, or import `pdf_ops.py` and call the whole pipeline as one
function.
What's included
Click and retype
Fidelity by inheritance
Font reuse
A per-change audit
Eight tools
Real direct manipulation
A properties cluster
Get started
Download the ZIP
Unzip & install
Extract, then run npm install
Run it
npm run dev and start shipping
Basic usage
from pdf_ops import Annotation, Edit, apply_edits
from sample_pdf import build_sample
raw = build_sample() # or: open("report.pdf", "rb").read()
edits = [
Edit(page=0, rect=(60, 60, 297, 85), text="FY27 Operations Review"),
Edit(page=0, rect=(60, 88, 248, 106), text="Prepared by the Operations Team"),
Edit(page=0, rect=(60, 396, 400, 412), mode="delete"),
]
markups = [
Annotation(kind="arrow", page=0, points=((155.5, 584.0), (310.9, 336.6)),
color=(0.85, 0.17, 0.17), width=2.5),
Annotation(kind="highlight", page=0, rect=(60, 202, 421, 220),
color=(1.0, 0.85, 0.2), fill_opacity=0.35),
]
pdf_bytes, report = apply_edits(raw, edits, markups)
open("report-edited.pdf", "wb").write(pdf_bytes)File structure
PDFLab/
├─ index.html # the entire editor: pdf.js canvas, text layer,
│ # markup toolbar, properties panel, export report
├─ app.py # FastAPI: upload, resolve, export, in-memory store
├─ pdf_ops.py # the engine: glyph removal, font reuse, drawing
├─ font_matching.py # family matching + the installed-font index
├─ sample_pdf.py # builds the demo document on demand
├─ requirements.txt # runtime deps (FastAPI, uvicorn, PyMuPDF)
├─ requirements-dev.txt # pytest + httpx, for the test suite
├─ conftest.py # puts the project root on sys.path for pytest
├─ LICENSE # Wholesaas Commercial License
├─ README.md # overview, API, limits, the demo recording
├─ docs/
│ └─ quickstart.md # install, file structure, basic usage, limits
├─ tests/ # 115 pytest tests
│ ├─ test_pdf_ops.py # the engine: glyph removal, artwork survival, rotation
│ ├─ test_api.py # every endpoint, limit and error path
│ ├─ test_fonts.py # family matching and the font index
│ └─ test_markups.py # pixel checks on the rendered markups
└─ demo/ # the recording, and how to re-record it
├─ pdf-editor-demo.gif # the animated demo in the README
├─ pdf-editor-demo.webm # the same run as video
├─ record.mjs # drives Chromium over the DevTools protocol
├─ overlay.js # the pointer, click ripples and captions
├─ assemble.py # frames → GIF + WebM, plus the verification
├─ hero.html # the product hero image (Tailwind CDN)
├─ hero.mjs # shoots it, and the two clean app screenshots
├─ pdflab-hero.png # the hero image, 2560×1440
├─ screenshots/ # editor.png, export-report.png — 2560×1600 each
└─ requirements.txt # Pillow, for assemble.pyMIT license
Free for personal and commercial use.
PDFLab — Click-to-Edit PDF Editor (HTML + Python · PyMuPDF) is free. Grab it.
A 3 MB ZIP, signed-in download, instant license key. The rest of the library is free too — explore more scripts.
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