How to Send Large Files to Clients Without Hitting a Limit

Every route has a ceiling, and the numbers differ by plan. This table lists what each service publishes, read on 11 October 2026. Plans change, so check the page before you promise a client a delivery date.

Two details trip people up. Gmail’s 25 MB is measured on the file, but the receiving server measures the encoded message, which runs about 37% larger; our guide to getting a PDF under Gmail’s limit measured it at 36.8% and recommends aiming at 18 MB, or 7 MB if you do not know the client’s mail server. And a free WeTransfer cap is a rolling allowance, not a per-file size, so a busy week of deliveries can use it up.

Compress it, and send the smaller copy by plain email if it now fits. If it still does not, send a link. The order matters because a client opens an attachment in one click, while a link adds a sign-in screen, an expiry date and a second step they may ignore.

• PDFs shrink most when they come from scans or design tools. Run the Small preset, then look at the size. Some generated PDFs barely move; see why a PDF is too big to upload.
• Photos shrink by resizing first. A 4032 × 3024 frame fitted inside 2000 pixels keeps about a quarter of its pixels.
• Video previews need lower resolution more than lower quality. Read how to compress a video small enough to email.
• Dropping the audio track from a silent screen demo is a setting in Smol’s video options.

The WeTransfer limit on a free account is 3 GB in any 30-day period, so it suits occasional deliveries. The Dropbox transfer limit is per transfer: 2 GB on Basic, 50 GB on Plus. Neither is a reason to send a file at full size when the client only needs to review it.

Dropbox Basic, Family and Plus transfers expire after 7 days; most business plans default to 30, according to Dropbox’s own page. A client who opens your link on day eight finds nothing, and a compressed copy that went by email would still be in their inbox. For the final high-resolution master, a transfer link is the right tool. For everything the client skims, compress and attach.

Start with these and adjust after you look at the output. The quality numbers are our starting points, not guarantees, and Smol sets quality and pixel size, not output bytes, so always check the resulting file before you send.

One benchmark for scale: on 24 small 768 × 512 film photographs, Smol at default settings made JPEGs 69.3% smaller. Camera-size files will differ; the conditions are on the benchmark page.

Drop the whole delivery folder in once, mix file types freely, and send the compressed copies. Mixed batches of images, PDFs and video are supported, so a project folder takes one pass.

1. 1

   Copy the project folder

   Work from a copy. Smol writes a _compressed file beside each original and does not overwrite by default.

2. 2

   Drag the folder into Smol

   The PDFs, images and clips queue together with per-file progress.

3. 3

   Pick settings per type

   Use the table above: PDF Small, JPG 75 to 80, MP4 H.264 Web.

4. 4

   Compress, then check the sizes

   Open the results in Finder and confirm the total is under your route’s limit. If a file grew, Smol keeps the original.

5. 5

   Send

   Attach if it fits. Otherwise upload the compressed set and share one link.

If you repeat the job weekly, add a Finder Quick Action so a right-click does it. Reserve watched folders for folders of fresh, unoptimized files, because they can make already-optimized files larger (details).

Free and built-in options come first, and for many jobs they are enough.

Compression and transfer are not rivals. If you send attachments from a small business, see email attachments for small businesses; for report-heavy work, see consultants sending reports. Compressing first means the link is faster to open and the free tier lasts longer. The Preview comparison and the five-method PDF test show where the built-in tools help and where they hurt.

• The client needs the original, pixel for pixel: RAW, layered PSD or a 4K master. Smol always re-encodes images and has no lossless mode, so send these through a transfer link.
• You need a PDF edited, signed, merged or redacted. Smol compresses PDFs and does not do those things.
• The sender is on Windows or a phone. Smol is macOS only.
• You need an exact byte target. Smol sets quality and size, not output bytes (images have a slow target-size mode, which is a band, not a ceiling).
• Your PDFs come from generators such as ReportLab: they can compress by almost nothing.

Do you work with a small team?

Team is $49 once for three Macs, and Enterprise is $20 a seat for 5 to 500 seats. Presets live on each Mac, so write your settings down and recreate them on each machine.