# Gmail Attachment Size Limit: 25 MB, the 33% Tax, and How to Get Around It ### The Gmail Attachment Size Limit Is 25 MB — With Two Asterisks The Gmail attachment size limit most people hit is **25 MB to send**. That number is correct for personal Gmail and for most Google Workspace accounts. It is also the number that produces the most confusion, because a file that looks like 22 MB on disk is routinely rejected. Two things sit between the advertised cap and a delivered message: 1. **Base64 encoding** inflates every attachment by about **33%** before it is transmitted. 2. **The recipient's limit** can be lower than yours. Gmail can receive 50 MB; plenty of corporate inboxes cannot. The smallest number in that chain wins. This is the same pattern as the [Outlook attachment size limit](/content/blog/outlook-attachment-size-limit/index.html), just with Google's numbers instead of Microsoft's. --- ### Gmail Attachment Size Limit by Account Type | Account | Send limit | Receive limit | Can it be raised? | | --- | --- | --- | --- | | Personal Gmail (@gmail.com) | **25 MB** | **50 MB** | No | | Google Workspace (most editions) | **25 MB** default | **50 MB** default | Yes — admin | | Google Workspace Enterprise Plus | **25–50 MB** (admin) | **70 MB** | Yes — admin, not on by default | | Gmail accessed via another client | 25 MB | 50 MB | No — Gmail's server still enforces it | The Enterprise Plus increase landed in **February 2026**. Administrators set a message size between 25 MB and 50 MB in 5 MB steps. Users cannot raise it themselves, and third-party outbound relays often still reject anything above 25 MB, so turning the dial up is not a free pass. For everyone else, including every personal Gmail account, **25 MB is the send ceiling and it is not moving**. A roundup of other providers lives in the [complete guide to email attachment size limits](/content/blog/complete-guide-email-attachment-size-limits/index.html). This page is the Gmail-specific version: the numbers, the encoding trap, the Drive-link behaviour, and the mailbox quota that silently sits behind all of it. --- ### The 33% Tax That Makes 25 MB a Lie Email cannot carry raw binary. Attachments are **Base64 encoded**, which represents every 3 bytes as 4 characters — an increase of roughly **33%** before the message leaves your browser. | File on disk | Size as transmitted | Passes a 25 MB send limit? | | --- | --- | --- | | 15 MB | ~20 MB | Yes | | 18 MB | ~24 MB | Just barely | | 20 MB | ~27 MB | **No** | | 24 MB | ~32 MB | **No** | Against the stated Gmail attachment size limit, your **real working ceiling is about 18 MB**. Size the file against that number, not 25. Multiple attachments share one budget, and HTML signatures eat a little more. That is also why "it was 24 MB and Gmail still bounced it" is the normal case, not a bug. --- ### What Gmail Does When You Go Over Gmail does not bounce the message back at you with a scary error the way a lot of corporate servers do. It **strips the attachment and inserts a Google Drive link** instead. That is convenient until it is not: - The recipient needs permission to open the Drive file. External clients frequently hit a sign-in wall. - The original file still lives in **your** Drive, counting against the 15 GB shared quota. - A Drive link is not an attachment. Some submission portals, ticketing systems, and legal workflows reject links on principle. - Drive links do not expire, which is a feature for collaborators and a liability for anything confidential sitting on a forwarded thread. If the goal is "this file in their inbox," a Drive link is a different product. Compressing until the file actually attaches is the one that preserves the original behaviour. --- ### The Gmail Mailbox Size Limit Is Not a Separate Number Searchers looking for a **Gmail mailbox size limit** are usually hitting a different wall: they can no longer send or receive attachments because **Google storage is full**. There is no dedicated Gmail mailbox quota. Storage is the **15 GB** (free) pool shared across: - Gmail (messages and attachments) - Google Drive - Google Photos Paid Google One and Workspace plans raise the pool; they do not split it. A library of original-quality phone photos will fill the 15 GB long before your inbox looks "full," and Gmail then refuses new attachments. Google's own help pages are explicit: when you reach the storage limit, you cannot send or receive attachments. If Photos is the hog, compressing before upload is the same move as [compressing photos for Google Photos](/content/blog/compress-photos-for-google-photos/index.html) — Storage Saver will re-encode for you, irreversibly, or you can compress first and keep control of the quality. --- ### How to Get Under the Gmail Attachment Size Limit Work these in order. Most people skip the first one and go straight to Drive. #### 1. Compress the file so it fits This is the only option that keeps a genuine attachment. It is also the one that works, because the files that miss 25 MB are almost always **video, photos, or image-heavy PDFs** — formats that shrink dramatically when re-encoded. | File | Typical original | After sensible compression | Fits in Gmail? | | --- | --- | --- | --- | | 4K phone video, 2 min | 250–400 MB | 12–25 MB | Usually | | 1080p screen recording, 5 min | 150–300 MB | 10–20 MB | Usually | | 40 camera JPEGs | 180 MB | 25–40 MB as a set; ~8–15 MB more aggressively | Split or compress harder | | PDF with embedded photos, 40 pages | 45 MB | 8–15 MB | Yes | | Excel workbook with images | 30 MB | Often 5–12 MB | Yes — see [compress an Excel file](/content/blog/compress-excel-file/index.html) | ZIP and 7z **do not help** for MP4, JPEG, PNG, HEIC, or already-compressed PDFs. Those formats have no redundancy left. Archiving a 30 MB video typically saves under 2%. For media, you have to re-encode, not wrap. [WinRAR for Mac](/content/blog/winrar-for-mac/index.html) and Finder's Compress are the wrong tool for this job; they are the right tool for documents, project folders, and logs. On a Mac, [Compresto](/content/site-root.html) compresses video, images, and PDFs locally with a target-size option, which is the practical way to aim at that 18 MB working ceiling. Nothing is uploaded. For a walkthrough aimed at mail specifically, see [reduce file size for email attachments](/content/blog/reduce-file-size-for-email-attachments/index.html) and [compress video for email](/content/blog/compress-video-for-email/index.html). If you need a hard cap, [compress a video to 25 MB](/content/blog/compress-video-to-25mb/index.html) is the same problem with the number in the title. #### 2. Let Gmail insert a Drive link Attach the file anyway. When it is over the Gmail attachment size limit, Gmail uploads it to Drive and swaps in a link. Confirm sharing is set to "anyone with the link" **or** to the specific recipient — the default is often too tight for people outside your organisation and too loose for anything private. Use this when the file genuinely cannot get under ~18 MB (a CAD package, a raw project, an uncompressed archive) and the recipient is fine clicking a link. #### 3. Use a transfer link instead of email For files that need to stay large — a ProRes master, a client dump, a folder of RAWs — email is the wrong channel. A dedicated transfer service or a cloud share is faster than pretending Gmail will carry it. [WeTransfer alternatives](/content/blog/wetransfer-alternative/index.html) and [how to send large video files](/content/blog/how-to-send-large-video-files/index.html) cover that path. Compressing first still helps: a 2 GB upload that becomes 80 MB is a better experience on both ends even when you are not attaching it. --- ### What Does Not Raise the Gmail Attachment Size Limit - **A Google One storage upgrade.** Extra terabytes do not change the 25 MB send cap. They only stop the "storage full" failure. - **Gmail offline, the desktop site, or the mobile app.** The limit is on Google's mail servers. The client is not what is blocking you. - **Splitting into 24 MB chunks by hand.** Recipients hate this, mail filters hate this, and Base64 will still push each chunk over if you sized them against 25 MB instead of 18 MB. - **Renaming the file.** Gmail is looking at encoded size, not the extension. --- ### FAQ #### What is the Gmail attachment size limit? Personal Gmail accounts can send **25 MB** and receive **50 MB** per message. Most Google Workspace editions use the same defaults. Enterprise Plus can go to **50 MB** send and **70 MB** receive if an administrator enables it. #### Why does Gmail reject a file that is under 25 MB? Base64 encoding adds about **33%**. A 20 MB file is ~27 MB on the wire. Plan for an 18 MB on-disk ceiling against a 25 MB cap. Several smaller files that add up to 25 MB will fail the same way. #### How do I send a file larger than 25 MB in Gmail? Compress it so it attaches, or let Gmail convert it to a Google Drive link. Compression is better when the file is video, photos, or a PDF. A Drive link is better when the file cannot shrink and the recipient can open Drive. #### Does Gmail compress attachments? No. Gmail does not re-encode video or recompress images. Oversized files become Drive links. Compression has to happen before you attach. #### What is the Gmail mailbox size limit? There isn't a separate mailbox cap. Gmail shares **15 GB** (or your paid quota) with Drive and Photos. When that pool is full, sending and receiving attachments stops even if the message itself is tiny. --- ### Make the File Fit The Gmail attachment size limit has been 25 MB for years. Cameras and screen recordings have not. Waiting for Google to raise the personal-account cap is not a workflow. **[Compresto](/content/site-root.html)** compresses the files that actually miss that cap — video, images, and PDFs — natively on macOS. Batch a folder of attachments, set a target size under 18 MB, and keep the result off Google's servers until you choose to send it.