pdfFiller vs UPDF
as AI assistants see them, week of 2026-09-21
Both pdfFiller and UPDF stay on the edges of AI answers about PDF tools. pdfFiller scores 4 overall and turns up in 3 of 68 answers, with a single mention each for browser-based editors, form fill-and-sign, and mobile PDF apps; it's absent from redaction, summarising, OCR, merging, and open-source questions. UPDF scores 2 overall, named in 4 of 68 answers, picking up single mentions for general 2026 editor picks, small-business value, mobile apps, and Mac editors, while missing browser, redaction, summarising, OCR, and merging questions entirely. Head-to-head, UPDF edges ahead on 3 questions, pdfFiller on 2, and the pair tie on 15.
Head to head
| metric | pdfFiller | UPDF |
|---|---|---|
| score | 4 | 2 |
| questions won | 3 | 4 |
By assistant
pdfFiller
| assistant | score | named in, this week | usual spot, this week |
|---|---|---|---|
| ChatGPT | 0 | 0% of answers | |
| Claude | 0 | 0% of answers | |
| Gemini | not sampled this week | ||
| Perplexity | 11 | 15% of answers | #3.3 |
UPDF
| assistant | score | named in, this week | usual spot, this week |
|---|---|---|---|
| ChatGPT | 0 | 0% of answers | |
| Claude | 7 | 10% of answers | #3.5 |
| Gemini | not sampled this week | ||
| Perplexity | 0 | 0% of answers |
Where they differ
Only pdfFiller gets named for
- What's the best tool to fill in and sign a PDF form?
- What's the best online PDF editor that works in the browser?
Only UPDF gets named for
- What's the best PDF editor for Mac?
- Which PDF editor is best value for a small business?
- What are the best PDF editors in 2026?
More comparisons
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- PDFsam Basic vs UPDF
Not sold on either?
Scores count how often each assistant names a product, weighted by position. How the score works · Full PDF editors leaderboard