Smallpdf vs iLovePDF vs Adobe Acrobat in 2026: Which PDF Compressor Is Best, and the Free Alternative (PDF24, Sejda, Jobbit)

Search "compress PDF" and the same three names fill the page: Smallpdf, iLovePDF and Adobe Acrobat. They look interchangeable, and for a single 3 MB brochure they are. The differences show up on the days that matter: when a tender portal wants a 40-page scan under 5 MB, when you have twelve files to shrink before a 5 pm deadline, when the document is a client's contract you would rather not upload anywhere, and when the free counter runs out. This Smallpdf vs iLovePDF comparison, with Adobe Acrobat, PDF24 and Sejda alongside, scores each tool on the things that decide those days: limits, quality, speed, privacy, price and what else it can do with the file afterwards.

It also covers a fourth option that did not exist two years ago. On Jobbit, a PDF compressor is one form in front of an AI agent: you state the size you need and the agent compresses to that number, checks the text is still readable and hands the file back in a chat, free, with no daily counter. Where a paid tool is still the better buy, this guide says so.

How we scored the PDF compressors

1. Free limits. Tasks per day, file size, pages, batch size, and whether the free tier watermarks or queues you.

2. Compression quality. Does text stay sharp? Can you choose a target size, or only a preset such as "basic" and "strong"?

3. Speed and batch. Time for a 40-page scan, and whether several files run at once.

4. Privacy. Where the file goes and when it is deleted.

5. Price on the vendor's pricing page in September 2026, in the currency it quotes. Prices change; treat them as a guide.

6. Beyond compression. Merge, split, convert, OCR, sign, and whether the tool can do the next job (the email, the cover letter) or only hand you a download.

Smallpdf vs iLovePDF vs Adobe Acrobat: the comparison table

Three findings from the table. First, on free limits Smallpdf is the tightest of the big three and PDF24 the most generous. Second, none of the big three lets you name a size; you pick a preset and hope. Third, price and privacy pull in opposite directions: the tools that keep files on your machine (PDF24 desktop, Sejda desktop) are the ones people rarely find.

Smallpdf: polished, and the strictest free tier

Smallpdf is the tool most people mean when they say "that PDF website". The interface is the cleanest of the group, every tool is one drag and one click, and the Pro plan bundles 20-odd tools, OCR and an e-signature workflow into a single subscription at $15 a month or $108 a year. The catch is the free tier: two tasks a day across the whole site, so compress once and merge once and you are done until tomorrow. Compression offers two presets, basic and strong; strong can turn a scanned form into a smudge, and there is no way to say "just get it under 5 MB". Files are uploaded to Smallpdf's servers and deleted after an hour. Best for: someone who processes PDFs every day and wants signatures in the same place.

iLovePDF: the best free website of the three

iLovePDF allows more free tasks than Smallpdf and offers three compression levels rather than two, plus a queue on busy days and file-size caps that lift on Premium. Premium is listed between $4 and $9 a month depending on billing and region, which makes it the cheapest paid plan here, and the Business tier at $15 per user adds team features. It has desktop and mobile apps, the desktop version keeping files local. The trade-off is the same as Smallpdf: presets instead of targets, and uploads for the web version. Best for: people who want a free website with few walls, or the cheapest subscription.

Adobe Acrobat: the editor that happens to compress

Acrobat's free online tools let you try each once before a sign-in wall, and the compressor is fine, with three levels. But Acrobat is a different product: Standard at about £14 a month and Pro at about £20 are full editors with redaction, forms, e-signatures with an audit trail and integration with Word and Outlook. If you already pay for Creative Cloud, you may have it. Buying it to compress files is buying a van to carry a parcel. Best for: contracts, forms and legal signing.

PDF24 and Sejda: the ones worth knowing

PDF24 is free, unlimited, ad-supported and offers a compression slider with a target DPI, which is the closest a website gets to naming a size. Its free Windows desktop app keeps everything local. It looks dated and that is the only reason it is not more famous. Sejda limits free use to three tasks an hour and 50 MB, has good editing tools, and sells a desktop app for $69 a year that also keeps files local. If you are on Windows and want a free, private, unlimited compressor, PDF24 is the answer nobody advertises.

The free alternative: tell an agent the size you need

The Jobbit PDF compressor changes the question. Instead of choosing a preset and checking the result, you say what the document is for (a job portal, an email, print), pick the target size (under 1 MB, 2 MB, 5 MB or 10 MB), attach the file and send. The agent compresses to the target, checks the text is still sharp, and returns the file in a chat with the before and after sizes. If the scan is too poor to hit the target, it tells you rather than delivering a blur.

Three things make the difference for a small business:

• No counter. A folder of twelve files is one message. The free plan's daily credits cover a normal day of PDFs.

• The next job is one sentence. "Merge it with the cover letter", "convert page 3 to Word", "write the email to the council that attaches this". A compressor website finishes with you at the download.

• Your files stay in your workspace. The job runs in the agent's sandbox on your account, not on a converter's shared server.

Where the paid tools still win: Acrobat or DocuSign for legally evidenced signatures, and any desktop app if you need to work with no internet. And a note on the other AI assistants: ChatGPT, Claude, Gemini, Copilot, Manus and Meta's Muse can all explain how to compress a PDF and some can attempt it, but they are general chat tools without a target-size form in front of them; the point of a dedicated tool page is that the first message is written for you and the result is a file, not advice. For most small businesses that makes Jobbit the best PDF compressor for the recurring job of getting under a portal's limit. The step-by-step method, including scanned documents and the exact message the tool sends, is in how to compress a PDF for free, and the wider category is ranked in best online PDF tools.

Which PDF compressor should you use?

• You compress a file now and then: iLovePDF's free tier, or PDF24 if you are on Windows and care about privacy.

• You hit portal size limits often: Jobbit's compressor, because you name the size.

• You process PDFs daily and want signatures too: Smallpdf Pro or Acrobat Standard.

• You need legal e-signatures with an audit trail: Acrobat or DocuSign, not a compressor.

• You work offline: PDF24 desktop (free) or Sejda desktop.

• You want the compression to be the start of a task, not the end: Jobbit, where the same chat merges, converts and writes the email.

All of Jobbit's four everyday tools are compared in free tools vs paid plans, and the whole set is on the tools page.

Frequently asked questions

Is Smallpdf or iLovePDF better?

For free use, iLovePDF: more tasks a day and three compression levels against Smallpdf's two. For a paid plan, Smallpdf Pro has the nicer interface and an e-signature workflow, while iLovePDF Premium is cheaper. Neither lets you name a target size; Jobbit's free compressor does.

Which PDF compressor keeps the best quality?

Quality depends on the level you pick, not the brand. All the tools here reduce image quality to shrink files; the ones that let you set a target size or DPI, PDF24 and Jobbit, avoid over-compressing because they stop when the file is small enough rather than applying a fixed preset.

How do I compress a PDF to under 5 MB for free?

On Jobbit's PDF compressor choose "under 5 MB", attach the file and send; the agent compresses to that target and confirms the final size. On Smallpdf or iLovePDF, run "strong" or "extreme" compression and check the result, repeating with a split if it is still too large.

Is it safe to upload contracts to Smallpdf or iLovePDF?

Both are reputable and delete files within one to two hours, but the document still leaves your control. For contracts, payslips, ID scans and client work, prefer a tool that keeps the file on your machine (PDF24 desktop, Sejda desktop) or in your own workspace (Jobbit).

Is Adobe Acrobat worth it just for compressing PDFs?

No. Acrobat Standard costs about £14 a month and earns its keep with editing, forms and legal e-signatures. If compression is the main job, a free tool covers it.

Can I compress PDFs in bulk for free?

PDF24 handles batches free on the web and desktop. Jobbit's compressor takes a folder in one message on the free plan. Smallpdf and iLovePDF reserve batch processing for paid plans.

What is the cheapest paid PDF tool?

iLovePDF Premium, from about $4 a month on annual billing, is the cheapest subscription in this comparison. Sejda's web plan at $7.50 and Smallpdf Pro at $15 follow. Jobbit's compressor is free on the free plan with no daily task cap.