To reduce PDF report size for a client, shrink the images inside it, because charts, screenshots and photos usually make a report heavy, not the text. On a Mac, drop the PDF into Smol, pick the Medium preset for a chart-heavy report, and check that the result is under the limit before you send it.
| What you are sending | The limit you hit | The Smol setting |
|---|---|---|
| Report PDF by Gmail | 25 MB per message; aim for about 18 MB | Small, then check the size |
| Report PDF to a client on Outlook with Exchange | 10 MB default total; aim for about 7 MB | Small, or Tiny if the charts are simple |
| Chart-heavy report where gridlines and labels must stay crisp | Whatever the mailbox allows | Medium, then zoom a chart to 200% |
| Report that will be printed by the client | No mailbox limit; print needs pixels | Large or Original, or send a link |
| Document properties such as author and title | Not a size limit | Strip Metadata as its own step |
How big can a report be before it is too big to email?
It depends on the client’s mail system, and you rarely know which one. The three numbers below come from Google and Microsoft’s own pages. All were opened on 11 October 2026.
| Mail system | Limit | What happens above it | Source |
|---|---|---|---|
| Gmail, personal account | 25 MB | Gmail removes the attachment and adds a Google Drive link | |
| Outlook 2013 and later, internet email account | 20 MB default, one file or several combined | Outlook shows an error and asks for a shared location instead | Microsoft Learn |
| Outlook on an Exchange Server mailbox | 10 MB default total, set by the administrator | Same error; the limit is the Maximum send size | Microsoft Learn |
| Exchange Online (Microsoft 365) | 35 MB sending and 36 MB receiving by default; admins can set 1 to 150 MB | The message is not delivered and the sender gets a non-delivery report | Microsoft Learn |
Aim below the cap. Microsoft says messages routed outside its datacenters take an additional 33% encoding increase, and our email PDF guide cites about 37% from Google’s documentation. Divide the cap by 1.37: about 18 MB for 25 MB, about 14 MB for 20 MB, about 7 MB for 10 MB. When you do not know the client’s system, aim at 7.
Why is my PDF report too big to email?
Images, nearly always. Text is small, while a chart pasted at a high pixel count is not, and a report with dozens of them adds up fast.
- Charts pasted as images from Excel, Tableau, Power BI or a screenshot are pixel grids, so file size follows pixel count.
- Photos, headshots and site images placed small on the page often carry far more pixels than the page can show.
- Scanned appendices are one full-page image per page; they compress well, as our scanned PDF test shows.
- Slide decks exported to PDF carry every full-bleed background image at its original size.
The useful number is effective PPI: image pixel width divided by the width it is placed at, in inches, as explained in what the PDF presets actually do. A chart that is 2,250 pixels wide placed 7.5 inches wide sits at 300 PPI, far more than a screen shows. Cutting pixels you cannot see is how you reduce PDF report size without hurting the page.
How do I compress a PDF with charts and keep it readable?
Use Medium first and check a chart. Smol’s PDF presets cap the long edge of each image in pixels, so the lower presets soften thin gridlines and small axis labels in raster charts before they touch the text.
| Preset | Long-edge image cap | JPEG quality (approx.) | Start here for |
|---|---|---|---|
| Tiny | 600 px | about 25 | Text-heavy report with a few photos; read on screen only |
| Small | 900 px | about 45 | The email preset; simple charts and screenshots |
| Medium | 1,200 px | about 60 | Chart-heavy reports with dense axes and small labels |
| Large | 1,800 px | about 75 | Reports the client may print or zoom into |
| Original | 2,400 px | about 88 | The least compression; it is not lossless |
Check the result where it matters. Open the compressed copy, zoom to 200% on the densest chart, and read the smallest axis label. If it is legible, send it. If not, go up one preset. Do not promise a percentage in advance: the saving depends on how many images the report holds and how large they are.
How do I send a large report to a client in five steps?
The same routine works for the final deliverable and for the draft you send on Thursday.
Export the report once, from the source
Export to PDF from your authoring tool. Keep that file as your master; Smol writes a separate copy with a
_compressedsuffix and does not overwrite by default.Drag the PDF into Smol
Drop several reports or a whole delivery folder in at once. Mixed file types in one batch are fine.
Choose the PDF preset
Medium for chart-heavy reports, Small for the email version. Run it and read the before and after size on each file.
Open the copy and zoom into a chart
Check the densest chart at 200%, a table with small type, and the cover. If any is soft, go up a preset and run again from the master.
Send it, with a link as backup
If the copy is still over the client’s limit, share the master through your normal file-sharing link and attach the smaller copy as the quick read.
What do consultants use today to reduce PDF report size?
The free options come first, and for a text-light report some of them work. Here is how they compare.
| Option | Cost | What it does well | Where it falls short |
|---|---|---|---|
| Export settings in the source tool (PowerPoint, Word, InDesign, Tableau) | Free | Fixes the cause: lower image resolution before the PDF exists | You must re-export, and each tool names the setting differently |
| Preview, Quartz Filter “Reduce File Size” | Free, built in | One click on image-heavy files | It grew a text-only 21-page contract by 111.8% in our test; see the Preview post |
| Acrobat’s PDF optimization tools | Paid Adobe product | Fine control over image resolution and fonts | More settings than most reports need; see the Acrobat alternatives page |
| Online PDF compressors | Free tiers, then paid | Nothing to install | Your client report is uploaded to a third party first |
| Smol | $29 once | Five presets, batch drops, per-file results, local processing | Mac only; a coarse preset ladder, not per-image controls |
If you only need one report shrunk once, Preview or an export setting may be enough. Details of each method are in reduce PDF file size on Mac and why Preview’s Reduce File Size can make PDFs worse. Smol earns its place when you do this weekly, send several deliverables at once, or do not want a client file to leave your machine. For the broader comparison, see Adobe Acrobat alternatives for Mac.
Is there anything else in a client deliverable file to check?
Yes: document properties. A PDF exported from your authoring tool often carries the author name, title, source file name and software, and no PDF preset strips these.
Smol’s Strip Metadata is a separate operation that clears document properties from PDFs without re-encoding. One caution: the cleared properties have been shown to be recoverable with a free tool unless the file is rewritten afterwards, so do not treat the result as forensically clean. We cover it in how to remove metadata from a PDF on Mac. Smol does not redact, so black boxes drawn over a confidential figure are not a substitute for removing it in the source file.
When is Smol the wrong tool for a client report?
Five cases.
- The report is mostly text and already small. Some generators produce PDFs that compress by almost nothing, and there are few images to shrink. Fix the source or send it as is.
- The client will print it at 300 PPI. Presets are pixel caps and Original re-encodes, so it is not lossless. For print, see compressing a PDF for print, or send a download link for the full file.
- You need to redact, OCR, edit, merge or split. Smol does none of these. Do them first in other software, then compress the finished file last.
- You do not use a Mac. Smol runs on macOS only (macOS 13 or later on Apple Silicon, macOS 14 or later on Intel).
- You need to compress on a server. A build pipeline wants the Smol API, not the Mac app.
What if you work in a small firm?
Pricing is Solo at $29 once for one Mac, Team at $49 once for three Macs managed from an admin dashboard, and Enterprise at $20 per seat, once, for 5 to 500 seats. A four-person practice buys Team plus Solo. Presets are per Mac, so write the standard setting in your delivery checklist and recreate it on each machine. The rest of the document stack is on the sales decks and freelancer client files pages.
Frequently asked questions
How do I reduce PDF report size without losing chart quality?
Lower the pixel count of images, not the quality of text. In Smol, run the report at the Medium preset, which caps the long edge of each image at 1,200 pixels, then zoom a dense chart to 200% and read the smallest label. If it is soft, go up to Large. The original is left untouched by default.
Why is my PDF report too big to email?
Charts, screenshots and photos inside the PDF carry more pixels than the page shows. A few large images outweigh dozens of pages of text. Mail servers also measure the encoded message, which adds roughly 33 to 37%, so a 20 MB PDF can fail a 25 MB cap. Shrink the images and aim below the limit.
What is the best way to send a large report to a client?
Compress it first, aiming at about 18 MB for a 25 MB cap or about 7 MB if you do not know the client’s system. If it is still too big, share a download link from your normal file-sharing service and attach the smaller copy. Gmail itself replaces attachments over 25 MB with a Drive link.
How do I compress a PDF with charts on a Mac?
Drag the PDF into Smol, choose a PDF preset (Medium for dense charts, Small for simple ones) and run it. Smol writes a copy beside the original, shows the size before and after, and does not upload anything. Check the densest chart at 200% before sending.
What is a good client deliverable file size?
There is no single number; it depends on the mailbox. Gmail allows 25 MB, Outlook defaults to 20 MB for internet accounts and 10 MB on an Exchange mailbox, and Exchange Online defaults to 35 MB sending. For an unknown recipient, aim around 7 MB after compression, or send a link.
Does Smol remove author names and other properties from a PDF?
Not when you compress: no PDF preset strips metadata. Strip Metadata is a separate operation that clears document properties without re-encoding. The result can be reversed with a free tool unless the file is rewritten afterwards, so it is not a guarantee of forensic cleanliness.
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