FLUX Outpainting: AI Image Editor Online
Bottom line
FLUX Outpainting extends a photo beyond its edges: up to 512 px per side with four sliders, final size up to 2048 px, a flat 12 credits per run. The model ignores the prompt. Open the Image Edit tool, select FLUX Outpainting, upload your image, and the exact credit cost appears before the edit runs.
FLUX Outpainting is Black Forest Labs' canvas extender, run on Runware (bfl:flux@outpainting). You upload one photo and set how many pixels to add on each side with four sliders: top, right, bottom and left. Each side goes up to 512 px in 16 px steps and starts at 64. The model fills the new area so it continues the scene. Each run costs a flat 12 credits, about $0.78 at the Lite one-time rate, however much canvas you add.
It is the tool for turning a tight crop into a wider banner, giving a product shot more breathing room, or fitting a square photo into a landscape slot without cropping the subject. One thing surprises people. The model does not read the prompt at all, but the edit form still needs some text before the button unlocks. Type anything and set the result with the sliders. The final size must stay within 2048 px, so large photos need smaller slider values. The 10 free signup credits are 2 short of one run.
FLUX Outpainting specs at a glance
These values come from VdoBloom's image-edit endpoint, the Runware outpainting service, the slider controls in the Image Edit tool and the credit table.
| Spec | FLUX Outpainting on VdoBloom |
|---|---|
| Price | 12 credits per run, flat (credit key flux-outpainting) |
| Input | Exactly 1 photo |
| Controls | Top, right, bottom, left sliders: 0 to 512 px each, 16 px steps, default 64 |
| Size limit | Final size (photo plus the two opposite sides) must stay within 2048 px; the provider rejects larger |
| All sliders at 0 | Rejected ('at least one outpaint direction must be > 0 pixels') |
| Prompt | Required by the form (up to 3,000 characters) but ignored by the model |
| Aspect-ratio / resolution menu | None; output size = photo size plus the pixels you add |
| Runs on | Runware (bfl:flux@outpainting) |
| Content filter | Moderate (VdoBloom's default tier) |
| Where to use it | Image Edit tool: /ai-photo-editor/?model=flux-outpainting |
What FLUX Outpainting costs
Every run costs 12 credits. Adding 16 px or the full 512 px on all four sides costs the same. The cost is shown before you confirm, and a failed run, including one the provider rejects for exceeding the size limit, is refunded automatically. Dollar figures use the Lite one-time pack: 300 credits for $19.50, about 6.5 cents a credit, and those credits never expire.
| Job | Credits | About (Lite one-time) |
|---|---|---|
| 1 run | 12 | $0.78 |
| 3 runs to settle the framing | 36 | $2.34 |
| 10 photos, one run each | 120 | $7.80 |
| Runs per 300-credit Lite pack | 25 | $19.50 for the pack |
| Runs on the 10 free signup credits | 0 (2 credits short) | FLUX.2 [dev] (4) fits instead |
Worked sizes: what the sliders produce
Output size is your photo's size plus the pixels you add, so you can plan the result before you spend credits. Width = photo width + left + right. Height = photo height + top + bottom. Each must stay within 2048 px.
| Source photo | Slider settings | Output | Fits 2048? |
|---|---|---|---|
| 1080 x 1080 square | Left 480, right 480 | 2040 x 1080 (about 1.9:1 banner) | Yes |
| 1080 x 1080 square | Left 512, right 512 | 2104 x 1080 | No, the provider rejects it |
| 1024 x 1024 square | All four sides 512 | 2048 x 2048 | Yes, exactly at the limit |
| 1080 x 1350 portrait | Left 304, right 304 | 1688 x 1350 (5:4) | Yes |
| 1920 x 1080 landscape | Left 64, right 64, top 0, bottom 0 | 2048 x 1080 | Yes, width exactly at the limit |
| Any photo | Defaults (64 on every side) | Photo + 128 px each way | If the photo is 1920 px or less per side |
FLUX Outpainting vs other Flux editors
People often confuse outpainting with instruction editing. Outpainting grows the frame and leaves the original pixels alone. The Kontext models change content inside the frame from a written instruction.
| FLUX Outpainting | Flux Kontext Pro | FLUX Erase | Flux 2 Pro I2I | |
|---|---|---|---|---|
| Job | Add canvas outside the frame | Change content inside the frame | Remove a masked object | Guided edit from up to 8 photos |
| Credits | 12 | 7 | 10 | 12 |
| Inputs | 1 photo + 4 sliders | Exactly 1 photo + instruction | Photo + mask | 1 to 8 photos + prompt |
| Reads the prompt | No | Yes | Mask drives the edit | Yes |
| Output size | Photo + added pixels, up to 2048 | Set by the ratio you pick (6) | Source and mask photos | 1K / 2K, ratio menu with auto |
| Picker rating | 4.2 | 4.3 | 4.2 | 4.1 |
Read more: Flux Kontext Pro · FLUX Erase · Flux 2 Pro I2I
The prompt box is required but has no effect
VdoBloom's Image Edit form will not submit without some prompt text, but FLUX Outpainting does not accept a prompt. The service drops it, and only the photo and four slider values reach the model. You cannot steer what appears in the new area with words. The model continues what is already in the photo. To add something specific to the extended area, outpaint first and then edit the result with an instruction model such as Flux Kontext Pro.
Where it runs on VdoBloom
Open the Image Edit tool and choose FLUX Outpainting. Upload one photo, set the four sliders, type any text in the prompt box, check the 12-credit cost and run. The result lands in your creations library at the new size. From there you can download it, edit the extended scene with an instruction model, or animate it in the Image to Video tool. The public AI Image Extender page describes the same workflow and runs on this model.
Common problems and fixes
Outpainting has few settings, so most problems come from the sliders or the size limit. A failed run is refunded automatically.
| What you see | Cause | Fix |
|---|---|---|
| 'At least one outpaint direction must be > 0 pixels' | All four sliders at 0 | Raise at least one side |
| The provider rejected the job | Final width or height over 2048 px | Use smaller values; for a 1920 px-wide photo, at most 128 px of total width |
| Canvas grew on sides you did not want | Every slider starts at 64 px | Set the unwanted sides to 0 before running |
| The new area ignored what you typed | The model does not accept a prompt | Outpaint first, then add details with Flux Kontext Pro (7 credits) |
| Needed more than 512 px on one side | 512 px is the per-side maximum | Run again on the result (12 credits per run), within the 2048 px limit |
| Not enough free credits | One run costs 12; signup gives 10 | Try FLUX.2 [dev] (4) or FLUX Erase (10) first |
Pick a Flux tool by job
The Flux models on VdoBloom each do a different job. Matching them by task, price and code-level limits:
| Job | Model | Credits |
|---|---|---|
| Add canvas around a photo | FLUX Outpainting | 12 |
| Remove an object with a mask | FLUX Erase | 10 |
| Change something inside the frame | Flux Kontext Pro / Max | 7 / 10 |
| Guided edit from up to 8 photos, 1K/2K | Flux 2 Pro I2I | 12 |
| Cheap square drafts from up to 4 photos | FLUX.2 [dev] | 4 |
Limits and weak cases
The model ignores the prompt, so you cannot choose what fills the new area. It takes one photo per run and adds at most 512 px per side. The final size cannot pass 2048 px in either direction, which limits how far a large photo can grow. A 1920 px-wide photo can only gain 128 px in width. Leaving every slider at 0 is rejected. At 12 credits, a run costs more than the 10 free signup credits. Failed runs are refunded, and VdoBloom's nudity check runs on the prompt text like every other edit.
What creators use FLUX Outpainting for
- Widening a square or portrait photo into a landscape banner or header without cropping the subject.
- Adding headroom or floor space so text can sit beside a product in an ad layout.
- Extending one side only to shift a subject off-centre in the frame.
- Fitting a photo into a wider slot (a website hero, a YouTube banner area) by growing the background instead of stretching or cropping.
How to use FLUX Outpainting on VdoBloom
- 1Open the Image Edit tool and select FLUX Outpainting.
- 2Upload the image(s) to edit and describe the change you want.
- 3Review the credit cost and generate. Results appear in your library.
Frequently asked questions
How much does FLUX Outpainting cost?
12 credits per run, flat, however many pixels you add. At the Lite one-time rate ($19.50 for 300 credits) that is about $0.78 a run, or 25 runs per pack.
Can I try FLUX Outpainting with the free credits?
Not on its own. New accounts get 10 free credits and one run costs 12. FLUX.2 [dev] (4 credits) or FLUX Erase (10) fit inside the free balance.
Does FLUX Outpainting use my prompt?
No. The model does not accept a prompt, so VdoBloom sends only the photo and the four slider values. The form still asks for some text before the button unlocks; type anything.
How far can FLUX Outpainting extend a photo?
Up to 512 px on each side, in 16 px steps. The final width (photo + left + right) and height (photo + top + bottom) must each stay within 2048 px, so large photos can grow less.
Why was my FLUX Outpainting job rejected?
Either all four sliders were at 0, which VdoBloom rejects because there is nothing to add, or the final size went over 2048 px, which the provider rejects. Lower the slider values for large photos. Failed runs are refunded.
Can I extend only one side?
Yes. Set the sides you want to keep to 0. The sliders start at 64 px on every side, so remember to zero the others.
FLUX Outpainting vs Flux Kontext: what is the difference?
Outpainting adds canvas outside the photo and ignores the prompt (12 credits). Flux Kontext Pro changes content inside the frame from a written instruction (7 credits, one photo). To extend and then change something, run Outpainting first and Kontext second.
How do I turn a square photo into a 16:9-style banner?
For a 1080 x 1080 photo, set left and right to 480 and top and bottom to 0. That gives 2040 x 1080, about 1.9:1. Going to 512 on both sides would make 2104 px, which is over the limit.
Can I extend more than 512 px on one side?
Not in a single run; 512 px is the per-side maximum. You can run FLUX Outpainting again on the extended result, at 12 credits per run, as long as the final size stays within 2048 px.
Is FLUX Outpainting censored?
It is in VdoBloom's Moderate content tier, the default, like the other Flux models. Runs the provider blocks are refunded.
FLUX Outpainting guides, prices and comparisons
This page is the FLUX Outpainting hub. Each guide below goes deeper on one question and links back here.
AI image extender
Widen a photo's canvas without cropping the subject.
How to use FLUX Outpainting
Expand any photo for 12 credits, step by step.
FLUX Outpainting pricing
12 credits a run, however much canvas you add.
Flux Kontext Pro vs FLUX Outpainting
Editing inside the frame vs growing the frame.
How to use FLUX Erase
The mask-based sibling for removing objects.