PUB to 3GP Converter

How to Convert PUB to 3GP Online

1. Upload Your PUB Files: Drag and drop or click "Add Files" to select your Microsoft Publisher (.pub) documents. Each PUB file is rasterized to an image, then assembled into a 3GP slideshow video. Batch upload is supported — multi-page Publisher files contribute one frame per page.
2. Pick Merge Strategy and Codec: Set Merge Strategy to "Merge images" for one combined 3GP, or "Video per image" for one 3GP per page. Default Video Codec is H.264 (MPEG-4 Part 10, AVC) which 3GP officially supports; switch to H.263 only if you need playback on legacy 3G feature phones. Audio Codec defaults to AMR-NB (the native 3GP speech codec) — output is silent because PUB has no audio track.
3. Set Image Duration, Background, Quality, Resolution (Optional): Image Duration ranges from 1/60 second to 10 seconds per frame — pick 6-10 seconds for pages with body text. Pick a Background Color for letterboxing (default Black). Under File Compression, choose Quality Preset (Highest through Lowest), Constant Quality (CRF), Constant Bitrate, Variable Bitrate, Specific File Size, or Target File Size %. Under Video Resolution, pick a preset (240p, 360p, 480p, 720p, 1080p, etc.) or set custom width/height.
4. Convert and Download: Click "Convert". Files process in your browser session — no sign-up, no watermark, no upload to a third-party account.

Why Convert PUB to 3GP?

Microsoft Publisher (.pub) is a binary format readable only by Publisher itself, which Microsoft is retiring on October 1, 2026 — Microsoft is actively warning users to migrate existing files before that date. 3GP is a 3GPP container (a slimmer cousin of MP4) standardized by ETSI for mobile multimedia, video calling, and MMS. Converting PUB to 3GP is a niche workflow — for most modern phones, PUB to MP4 is a better target — but a 3GP rendering still has a few specific uses:

• Legacy GSM and feature-phone delivery — H.263 + AMR-NB inside a 3GP container is the lowest-common-denominator video format that older 3G handsets and basic Nokia/Samsung feature phones can decode without extra apps.
• MMS-friendly file sizes — carriers cap MMS attachments tightly: Verizon allows roughly 1.2 MB images and 3.5 MB video, T-Mobile sends about 1 MB, AT&T around 1 MB. A short 240p H.263 3GP slideshow of a Publisher flyer typically fits these caps where an MP4 will not.
• Pre-EOL Publisher archive — if you have stacks of legacy .pub flyers, brochures, or programs and want a single mobile-playable archive that does not depend on Publisher being installed (or supported), a 3GP slideshow is a self-contained way to scroll through them on a phone gallery app.
• Embedded device and kiosk demos — older industrial digital signage and embedded media players sometimes only decode 3GP/H.263 streams; rasterizing a Publisher layout to 3GP is a way to feed those devices.
• Quick share when MP4 is rejected — some legacy email gateways and corporate filters strip MP4 attachments but pass 3GP because it is much smaller and was historically tagged as a phone-message format.

If your goal is a modern phone, tablet, or social platform, convert to PUB to PDF, PUB to JPG, or PUB to MP4 instead — those formats render with full-resolution text and are universally supported.

PUB vs 3GP — Format Comparison

3GP Codec and Quality Quick Guide

3GP is a constrained format — only a small set of codecs are officially compliant. Pick by your target device.

Frequently Asked Questions

Why is converting Microsoft Publisher to a video format like 3GP useful at all?

It is a niche workflow. PUB is a print-layout format and 3GP is a low-bitrate mobile video container — there is no native pairing. The two reasons it makes sense are (a) sharing a Publisher flyer or brochure with someone on a feature phone or via MMS where document attachments are blocked, and (b) building a tiny, self-contained mobile-playable archive of legacy .pub files ahead of Microsoft Publisher's October 1, 2026 end of support. For everything else, PUB to PDF or PUB to MP4 is the better destination.

What resolution should I use for readable Publisher text?

Use 480p or higher if you want body copy to stay legible. 240p and 360p are tempting because they keep the file inside MMS limits, but 8-10 pt body text in a Publisher document will smear at those sizes. If you need both small file size and readable text, narrow the page count, raise Image Duration to 8-10 seconds per frame, and stay at 480p with the H.264 codec — it will compress better than H.263 at the same visual quality.

Will the output 3GP have any sound?

No. Publisher files contain text and graphics, not audio. The Audio Codec setting (AMR-NB by default) only affects the empty audio stream's signaling — the resulting 3GP plays silently. If you want a voiceover, convert to MP4 with PUB to MP4 and add audio in a video editor afterward.

My carrier rejected the 3GP MMS — what happened?

MMS file-size caps are aggressive and inconsistent. Verizon caps outbound MMS around 1.2 MB for images and 3.5 MB for video, T-Mobile sends roughly 1 MB, and AT&T limits videos to about 1 MB. If your converted 3GP is over the carrier's send limit, the MMS gateway either rejects it or transcodes it down to an unwatchable thumbnail. Reduce Image Duration, lower the resolution preset to 240p, switch the Quality Preset to Lowest, or trim the page count until the file is under ~500 KB to stay safely inside any carrier's cap.

How does the conversion handle multi-page Publisher documents?

Each PUB page is rasterized to an image, and the images are concatenated into the video using your chosen Image Duration. So a 6-page Publisher brochure with Image Duration set to 5 seconds becomes a 30-second 3GP slideshow. If you upload several .pub files at once with "Merge images" selected, every page from every file flows into a single output video in upload order.

Should I pick H.263 or H.264 for the video codec?

Pick H.264 unless you have a specific reason not to. H.264 is part of the official 3GP specification (3GPP TS 26.244) and is decoded by almost every phone made since 2008, including modern iPhones and Android handsets. H.263 was the original 3GP codec and is now considered a legacy design used only for compatibility with older products. The only time H.263 wins is if you are explicitly targeting a 2005-era feature phone that does not implement H.264.

Is 3GP still a sensible format in 2026?

Mostly no. 3GP was designed for the bandwidth and CPU constraints of 3G phones; modern handsets, messaging apps, and websites all prefer MP4 / H.264 (or HEVC and AV1). Convert to MP4 with PUB to MP4 for any modern target. The legitimate remaining use cases for 3GP are MMS to feature phones, certain embedded devices and digital signage hardware, and forensic / archival contexts where you specifically want the legacy container.

What happens to my files after conversion?

Files are processed in your browser session and not stored on a permanent account. The output 3GP downloads directly to your device. Because Microsoft has confirmed Publisher reaches end of support on October 1, 2026, this is also a reasonable moment to convert your full .pub library to a more durable format — typically PUB to PDF for archival quality, or PUB to PNG/JPG if you want individual page images.

Why is the Trim option not visible?

Trim is hidden because there is no source video timeline to trim — you are building the video from static Publisher pages. Control the runtime by adjusting Image Duration (1/60 second to 10 seconds per frame) and the number of PUB pages or files you upload.