LightPDF pairs browser-based PDF editing, conversion, OCR and signing with document AI for summaries, translation and data extraction. One account covers web, Windows, Mac, iOS, Android and a Chrome extension, with AI actions billed in credits.
LightPDF is an AI PDF editor that runs in a browser tab, published by Wangxu Technology Co.,Ltd., the company that holds the LightPDF trademark and is registered in Shenzhen, China. The same company is named as the seller of the iOS app, and the brand dates to January 2018.
The scope is wide rather than deep: one account covers editing, conversion, OCR, annotation, signing, page organisation, compression, protection and redaction, plus a document-AI layer that summarises, translates, extracts tables and generates new files.
Two structural facts shape most decisions. Nearly every AI action is priced in AI credits, so the useful question is not whether a feature is included but how many credits one run costs. And the free tier is narrow: web-only, capped at 10MB per file, rationed per day or per file on the AI side.
The AI Agent changes how the toolkit gets used: you describe the outcome instead of opening one tool per task. It accepts single-step instructions such as converting a PDF to Word, merging files or removing a watermark, and it can chain multiple commands together — convert, merge and compress in one pass. On the free tier the agent allows 3 questions/day.
Document chat sits beside it: upload PDFs, scans, Office files, EPub, TXT or a web page and ask questions, with answers citing the source. The summariser adds controls for language, response style, length and web access.
Conversion covers Office and image targets both ways and adds formats generic converters skip: Markdown, PDF/A, long image, OFD, CAJ, CAD and EPUB. Scanned files take a different path — standard PDFs use direct conversion, while scanned or image-based PDFs need OCR mode to extract text accurately; choosing wrongly is the usual cause of a garbled Word file. A separate group reads business paperwork into spreadsheets rather than flat text, with its own entry points for statements, invoices, receipts and purchase orders.
The PDF watermark remover is layered rather than a single filter: automatic detection for whole-page marks, a manual mode with rectangle, lasso, brush and object-detector tools, and a deep-erase mode for stubborn cases. The same engine clears logos, stickers, timestamps and objects from photos — up to 50 images can be uploaded at once and processed together. For permanent rather than cosmetic removal, the PDF Eraser offers two erasure modes: Consistent Erase, which removes the selected area across all pages, or Selective Erase, which affects only the current page.
Page handling covers split, merge, crop, rotate, deskew and flatten, plus one uncommon operation: while ordinary splitters separate a multi-page file into individual pages, Cut PDF works inside a page, slicing it along horizontal and vertical guides. Comparison highlights differences with overlays, and translation keeps formatting rather than dumping plain text, translating complete documents while preserving the original layout, with support for 20+ languages.
Step 5 catches most people: nothing is parked in a history list, and on metered tools leaving the page means paying twice.
Treat generation as a first draft and edit inside the preview: swapping deck templates or correcting invoice totals costs nothing, while each regeneration is a separate billable run. And enhance scans before reading them, because OCR on a skewed, shadowed scan produces text that takes longer to repair than the enhancement pass would have cost.
Finance and bookkeeping. Structured data is extracted from invoices, receipts, bank statements and purchase orders at 2 credits per page, so a month of paperwork becomes spreadsheet rows instead of flat text. A month of statements becomes reconcilable without retyping, and the per-page rate makes the cost knowable before you start.
Research and study. Long papers and scanned references suit chat-with-document plus layout-preserving translation, so a foreign-language paper stays readable as a paper. Turning a recorded briefing into slides is where the generators earn their place.
Scanned archives and odd layouts. Two-up scans and wide spreadsheets printed to PDF are what Cut PDF enables you to divide a single page into multiple segments using horizontal and vertical split lines was built for; enhancement plus OCR then makes the segments searchable.
LightPDF fits people whose PDF work is broad but intermittent: a student converting and summarising references, an office user needing occasional editing and signing without a desktop licence, a freelancer processing client documents on whatever machine is nearby.
It fits poorly in three cases. Large files hit the ceiling immediately, because the free plan is Web Only with a Maximum File Size of 10MB. Long evaluations are unavailable: the yearly plan also includes a 3-day free trial, giving you access to Premium features before you are charged, and that trial is attached to the yearly plan alone. Heavy daily AI usage needs credit modelling first, since Advanced document enhancement runs at 40 credits/page against 2 credits/page for Basic.
Teams sit in between: enterprise plans with centralised billing and volume discounts are advertised but not priced publicly, so only the individual tiers can be compared up front.
Licensing is account-based with one hard limit: one Premium account works across 5 platforms: Windows, Mac, Android, iOS, and the web. You can sign in with the same account on different platforms, but Premium features can only be used on one device at a time — so a two-person team cannot share one subscription.
Mobile browsers are not equivalent to mobile apps. Ten tools are listed as unavailable there — Edit PDF, Watermark PDF, PDF Eraser, Split PDF, Crop PDF, Rotate PDF, Annotate PDF, Sign PDF, PDF Comparison and PDF Redaction — which strips most of the editing surface on a phone.
Store signals diverge and should be read together. A third-party consumer review platform shows 3.8 from 76 reviews, with 80% at five stars and 13% at one star; the Android listing captured in this round showed 2.5 with 964 reviews against 500k+ downloads. Different populations and different measured objects — a website versus a mobile app — cannot be averaged, but the gap is wide enough that mobile buyers should trial first.
| Plan | Listed price | Platforms | Max file size | AI credits |
|---|---|---|---|---|
| Free | $0 | Web only | 10MB | Per-day / per-file limits |
| Monthly | $5.99 /mo | Web, mobile, desktop | Unlimited | 1,000/month, expire monthly |
| Yearly | $15.99 /yr | Web, mobile, desktop | Unlimited | 1,000/month, expire monthly |
| Lifetime | $39.99 one-time | Web, mobile, desktop | Unlimited | 40,000 total, valid until used |
The credit rules deserve re-reading. Monthly: 1,000 credits/month. Unused credits expire monthly. Yearly: 1,000 credits/month. Unused credits expire monthly. Lifetime: 40,000 credits, valid until used. A yearly subscriber does not get twelve thousand credits to spend freely; they get a thousand a month that vanish at month end, whereas the one-time plan's credits are delivered once and remain permanently valid until used.
Individual prices set the budget: chat at 5 credits per use, translation at 5 credits per page, a generated deck at 20 credits per file, generated PDFs from 20 up to 140~160 credits per file for long output, and text editing inside images or scans at 40 credits per use.
The free tier suits evaluation, not production: the AI Agent allows 3 questions/day, document chat allows 1 file/day, most other AI tools allow a single file before a paywall, and the image watermark remover advertises a free version limited to 3 Images, original quality. Those are trial allowances, not a workable free plan.
Billing mechanics:
One inconsistency is worth knowing before purchase. The pricing page sells three individual tiers, at $5.99 /mo, $15.99 /yr and $39.99 one-time. Elsewhere the service terms state that LightPDF VIP has payment options of weekly, monthly, and yearly. The refund schedule works from five tiers again, with base amounts of $13.99 weekly, $19.99 monthly, $49.99 yearly, $99.99 for three years and $109.99 perpetual. No page explains how the three sets relate to one another; what you pay is the figure shown at checkout.
Cryptographic signatures rather than drawn ones. The web app places drawn or uploaded signature images, and the note is explicit: the Digital Signature feature is currently available only in the desktop version. If signing must be certificate-based and browser-based at once, look elsewhere.
Team deployment or commercial use of the desktop app. The licence is narrow: it allows you to install and use one copy of the Software on a single computer at a time, and separately, you cannot use the software for commercial purpose or provide it to multiple users unless you have got commercial/multi-user license.
A published, time-bound retention guarantee. As the next section shows, retention wording differs between pages and none of it appears as a commitment in the privacy policy. Organisations bound by a written data-handling standard need a supplier that states one retention period in its policy.
The retention promise is not stated consistently. The user guide says all processed files are stored temporarily and will be regularly deleted from our servers to ensure data privacy, without naming an interval. The PDF watermark remover page says we automatically delete both your original and processed files after 24 hours, while the FAQ on that same page says files are deleted after processing. Three formulations, two on one page — treat none as a guaranteed deletion window.
The privacy policy, carrying an Update Date: June 27, 2022, restates none of those intervals; it covers account data rather than processed files. If you delete your account, we will initiate the deletion of this information immediately, though it warns of latency in servers and backup storage. On whether uploaded documents are used to train AI models, the official pages checked in this round make no statement in either direction.
The separately sold OCR membership keeps its own rules: the maximum file size of OCR VIP service: 30 MB, and it is non-returnable once touched — if you have used OCR VIP service, no matter how many pages you have used, we will not refund.
Watermark removal is the headline capability and the one with legal exposure. The vendor's position is stated plainly: using watermark removers is legal, but it strongly advises against removing watermarks from copyrighted images, to respect fair use and avoid violating copyright laws.
Set expectations from mixed signals rather than the marketing page: third-party review distributions are polarised, and app-store and website populations disagree. Independent editorial coverage from major technology publications was not found in this round's searches.
There is no single published answer: the user guide says processed files are deleted regularly without naming an interval, one tool page states 24 hours, and that page's own FAQ says deletion happens after processing. Because the wording differs by page, do not plan around a specific window.
The official pages reviewed in this round — privacy policy, terms of service, payment terms, licence agreement and user guide — make no statement about training on user content. Treat it as unanswered rather than as a guarantee.
On monthly and yearly plans each batch is valid for one calendar month and expires automatically; on the one-time plan the credits stay valid until used.
The window depends on the plan — 30 days for Perpetual, 7 days for Annual, 3 days for Monthly — and the amount is reduced by credits already consumed. The 50-credit package and the weekly pass are excluded.
