TweakPDF

TweakPDF changes a word, date, name or amount inside a finished PDF in the document's own font. Most online editors cover the old text with a white box and type over it in Arial. TweakPDF rewrites the text in the PDF itself and reuses the font embedded in the file, so the edit doesn't stand out. How it works: open the PDF in the browser, click the text, type the new value, download. Scanned PDFs go through OCR first. It can also add a signature. The free plan gives 3 downloads a month. Stack: Next.js on the front end, and a Python/FastAPI engine with pikepdf, fontTools and pdfium for parsing, fonts and rendering, plus Tesseract for OCR. Built solo in Kraków.