What canvas size does the combined GIF use?

The first uploaded GIF's width and height become the combined canvas size. Any later GIF whose frames don't already match that size are stretch-resized (nearest-neighbor) to fit, rather than cropped or padded.

In what order do the frames end up in the combined GIF?

Exactly the order you uploaded the source GIFs in: all of the first GIF's frames, then all of the second's, and so on.

How many GIFs can I join at once?

At least two are required, and you can add more as long as the combined frame count doesn't exceed this codec's 256-frame ceiling.

Does each source GIF keep its own frame delays in the combined file?

Yes, every frame keeps its own original delay from its source GIF; only the loop count is set fresh for the combined output.

GIF Joiner - Combine Multiple GIFs Into One

Overview

Introduction

Stitching several separate animated GIFs into one combined playlist-style animation usually means re-exporting from scratch in dedicated software. This tool concatenates their frames directly, in the order you upload them.

Decoding, resizing, and re-encoding all happen locally in your browser, so uploaded animations never leave your machine.

What Is GIF Joiner?

A structural GIF editor that combines two or more separate animated GIFs into one, by concatenating every source GIF's frames end-to-end in upload order.

The combined canvas size always follows the first uploaded GIF; later GIFs are resized to match if needed.

How GIF Joiner Works

Each uploaded GIF is decoded independently into its own frame array using this category's shared decoder.

The first GIF's canvas dimensions become the target size; every later GIF's frames are stretch-resized (nearest-neighbor) to match if they differ, then all frame arrays are concatenated in upload order and re-encoded as one combined GIF89a file.

When To Use GIF Joiner

Use it to build a single combined animation out of several separately-created GIF clips.

It's also useful for assembling a slideshow-style sequence from a handful of short animated GIFs.

Often used alongside GIF Splitter, GIF Frame Adder and GIF Frame Rearranger.

Features

Advantages

Joins any number of source GIFs (2 or more) in a single operation, in exactly the order you upload them.
Automatically handles mismatched canvas sizes rather than rejecting differently-sized source files outright.
Every frame's original delay is preserved from its source GIF.

Limitations

Later GIFs with a different aspect ratio than the first are stretched, not cropped or padded, which can visibly distort them.
The combined GIF is capped at 256 total frames by this codec, which may be a real constraint when joining several longer source animations.

Examples

Joining a 4-frame intro GIF and a 6-frame main GIF

Input

GIF A (4 frames, 200x200) uploaded first, GIF B (6 frames, 150x150) uploaded second.

Output

A 10-frame GIF at 200x200: GIF A's 4 frames unchanged, followed by GIF B's 6 frames stretch-resized up to 200x200.

The first GIF's dimensions set the combined canvas; the second GIF's smaller frames are resized to match before being appended.

Best Practices & Notes

Best Practices

Upload the GIF whose canvas size and aspect ratio you want to keep as the FIRST file, since it sets the target dimensions for everything else.
Pre-crop or pre-resize source GIFs to a matching aspect ratio beforehand if stretching would visibly distort them.
Check the combined frame count against the 256-frame ceiling before joining several longer animations.

Developer Notes

Resizing reuses the PNG category's shared `resizeNearest` helper, the same one GIF Frame Adder uses for mismatched still images, keeping this category's resize behavior consistent across every tool that needs it rather than maintaining parallel implementations.

GIF Joiner Use Cases

Combining a short intro clip and a main animation into one continuous GIF
Building a slideshow-style animation out of several individually-created GIF clips
Merging reaction GIFs or stickers created separately into a single combined file

Common Mistakes

Uploading the GIFs in the wrong order and getting a combined animation that plays back out of the intended sequence.
Not accounting for aspect-ratio distortion when later GIFs have a very different shape than the first.

Tips

If you need to reverse this operation later, GIF Splitter can cut a combined GIF back into separate files at chosen frame boundaries.
Preview the joined result with GIF Frame Player before distributing it, especially to check the resize didn't distort anything unexpectedly.

GIF Joiner