Video to GIF Converter

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add caption to gif from video

How to put a caption on a GIF made from a video

Open Advanced options, type the caption and choose position, color and size. The result frame, next to the timeline, shows the caption over the current frame already cropped, and the same text is drawn on every GIF frame when generating.

How the text is measured and placed

Letter size is a percentage of the output frame height, between 4% and 20%, not a pixel value. That way the caption keeps the same presence when you change the GIF width. On a frame 270 px tall, 10% gives a 27 px font, 4% gives 11 px and 20% gives 54 px; below 8 px the font does not go lower, so it never becomes unreadable. Each line height is 1.15 times the rounded font, or 31 px for 27 px.
The text is wrapped into lines using 92% of the frame width, measuring each word with the browser real font. If it goes past 4 lines, the font shrinks by 10% at a time until it fits, and a single word wider than the line is split by character. The field accepts up to 120 characters. Vertical position uses a margin of 4% of the height: at the top the first line starts 11 px from the edge on a 270 px frame, and at the bottom the block ends 11 px from the floor.
The outline, on by default, draws each line twice: first a thick stroke in the contrasting color (black under white or yellow, white under black) and then the fill. Thickness is the font divided by 7, with a minimum of 2 px. That technique keeps text readable on light and dark backgrounds and explains why the meme style uses white letters with a black border. Uppercase, also on by default, makes the caption shorter in average width and quicker to read in a short time.

Checked examples

Default font

Input: 270 px × 10%
Expected output: 27 px

A 480x270 frame with size 10%: 27 px font and 31 px lines.

Control extremes

Input: 270 px × 4% | 20%
Expected output: 11 px | 54 px

The size control limits on the same 270 px frame.

One-line caption at the bottom

Input: 270 px, base, 1 linha
Expected output: y = 228

270 minus the 11 px margin minus the 31 px line: the line top sits at 228 px.

Caption at the top

Input: 270 px, topo, 1 linha
Expected output: y = 11

The first line starts at the 4% height margin.

Caption in the middle

Input: 270 px, meio, 1 linha
Expected output: y = 120

(270 minus 31) divided by 2, rounded: 120 px.

Full tool FAQ

How do I convert a video to GIF without uploading the file?

Pick the file, mark the clip and click Generate. The tool extracts frames with the browser's own player, draws each one on a canvas and builds the GIF in memory, all on your device. Nothing is sent to a server, so there is no queue, no upload limit and no copy of your video anywhere.

What FPS and width should I use?

Why is the GIF so heavy?

What is the difference between None, Bayer and Floyd-Steinberg dithering?

Global or per-frame palette? What is optimizing repeated pixels?

How do I add a caption to the GIF?

GIF, animated WebP or short video: which one?

What is the maximum clip length?

How do I make the GIF play once, repeat or ping-pong?

Does it work on phones and in any browser?

Frequently asked questions

Why does the font look smaller in the GIF than in the preview?

The preview shows the frame at up to 480 px wide, and the GIF may be smaller or larger. Since the size is a percentage of height, the letter proportion relative to the frame is the same in both; what changes is the physical size on the screen where you open the file.

Can I use my own font or emojis?

The caption uses the Impact font when the system has it, then Arial Black and then the system default font, always bold. There is no font choice. Emojis and accents appear according to the device system, which makes the result slightly different between computers.

Does the caption show across the whole GIF?

Yes, it is drawn on every frame, in the same position. There is no caption that changes over time. For two lines at different moments, generate two GIFs from different clips, each with its own caption.

Next steps

How the text is measured and placed

Letter size is a percentage of the output frame height, between 4% and 20%, not a pixel value. That way the caption keeps the same presence when you change the GIF width. On a frame 270 px tall, 10% gives a 27 px font, 4% gives 11 px and 20% gives 54 px; below 8 px the font does not go lower, so it never becomes unreadable. Each line height is 1.15 times the rounded font, or 31 px for 27 px.

The text is wrapped into lines using 92% of the frame width, measuring each word with the browser real font. If it goes past 4 lines, the font shrinks by 10% at a time until it fits, and a single word wider than the line is split by character. The field accepts up to 120 characters. Vertical position uses a margin of 4% of the height: at the top the first line starts 11 px from the edge on a 270 px frame, and at the bottom the block ends 11 px from the floor.

The outline, on by default, draws each line twice: first a thick stroke in the contrasting color (black under white or yellow, white under black) and then the fill. Thickness is the font divided by 7, with a minimum of 2 px. That technique keeps text readable on light and dark backgrounds and explains why the meme style uses white letters with a black border. Uppercase, also on by default, makes the caption shorter in average width and quicker to read in a short time.

Checked examples

Default font

Input: 270 px × 10%
Expected output: 27 px

A 480x270 frame with size 10%: 27 px font and 31 px lines.

Control extremes

Input: 270 px × 4% | 20%
Expected output: 11 px | 54 px

The size control limits on the same 270 px frame.

One-line caption at the bottom

Input: 270 px, base, 1 linha
Expected output: y = 228

270 minus the 11 px margin minus the 31 px line: the line top sits at 228 px.

Caption at the top

Input: 270 px, topo, 1 linha
Expected output: y = 11

The first line starts at the 4% height margin.

Caption in the middle

Input: 270 px, meio, 1 linha
Expected output: y = 120

(270 minus 31) divided by 2, rounded: 120 px.

Full tool FAQ

How do I convert a video to GIF without uploading the file?

What FPS and width should I use?

Why is the GIF so heavy?

What is the difference between None, Bayer and Floyd-Steinberg dithering?

Global or per-frame palette? What is optimizing repeated pixels?

How do I add a caption to the GIF?

GIF, animated WebP or short video: which one?

What is the maximum clip length?

How do I make the GIF play once, repeat or ping-pong?

Does it work on phones and in any browser?

Frequently asked questions