
Oct 8, 2026
Best Free Online 3D Viewers in 2026: GLB, STL, OBJ, FBX
Six free ways to open a 3D file without installing much, compared on formats, upload, sign-in and limits, including the TRELLIS.2 browser viewer.

Every recipe below has the same job: tell the model what to keep, what to change, where the subject is, how the scene is lit and what to avoid. The costume is only one line. The preservation and exclusion lines are what keep the face and body together.
Copy a recipe, paste it into the generator, then change one variable at a time. If you change the costume, the scene and the lighting in the same run, you will not know which change caused a failure.
A gothic portrait with violet braids, silver accessories and a moonlit garden. Strong for a full costume edit.
Prompt recipe
Costume, hair and scene in one recipe. Keep the face and pose.
Use the uploaded photo as the primary reference. Preserve the subject's recognizable facial identity, facial proportions, skin tone, approximate age and natural anatomy. Transform the subject into an original gothic Halloween fashion portrait. Change the hairstyle into long violet braids decorated with delicate silver hair accessories. Replace the clothing with an elegant black-and-purple velvet outfit featuring subtle lace and metallic details. Place the subject in a moonlit Victorian garden with soft fog, glowing lanterns and dark autumn foliage. Use photorealistic editorial photography, realistic fabric textures, natural skin details and cinematic soft lighting. Keep the same number of people as the uploaded photo. Avoid altered facial identity, extra limbs, duplicated fingers, distorted anatomy, text, logos and watermarks.
The prompt is pre-filled in the generator. Review it and the credit cost before you start.
A celestial gown with a star field and a moon crown. The deep-blue palette is the anchor.
Prompt recipe
A glowing gown and an observatory scene, with the face kept intact.
Edit the uploaded photo into an original celestial Halloween princess portrait. Preserve the subject's recognizable face, natural skin texture, body proportions and pose. Replace the outfit with a midnight-blue fantasy gown featuring silver embroidery, softly glowing star patterns and realistic flowing fabric. Add a delicate silver moon crown and luminous accessories. Place the subject inside a moonlit observatory with a starry sky visible through tall windows. Use elegant fantasy fashion photography, realistic fabric details, cinematic rim lighting and a deep-blue, silver and violet color palette. Keep the person recognizable. Avoid altered facial identity, extra people, distorted anatomy, text and watermarks.
The prompt is pre-filled in the generator. Review it and the credit cost before you start.
A wearable robot costume, not a robot head. Useful for a tech or sci-fi party look.
Prompt recipe
Armor panels, blue LEDs and a believable costume fit.
Using the uploaded photo as reference, transform the subject into a futuristic Halloween robot costume portrait. Preserve the subject's recognizable face, skin tone, head proportions and original pose. Create a realistic wearable robot costume featuring metallic-looking armor panels, subtle blue LED accents and articulated shoulder pieces. The outfit should look like a believable costume worn by a real person, not a completely new mechanical character. Use dramatic blue-and-orange cinematic studio lighting and realistic material reflections. Do not replace the subject's face with a robot head. Avoid extra limbs, distorted hands, duplicated body parts, logos and text.
The prompt is pre-filled in the generator. Review it and the credit cost before you start.
A pet portrait with a soft pumpkin costume. Keep the eyes clear and the species unchanged.
Prompt recipe
A cozy autumn studio setup for one pet.
Use the uploaded pet photo as the primary reference. Preserve the animal's original breed, fur color, distinctive markings, eye color, facial appearance and natural anatomy. Dress the pet in a soft pumpkin-inspired Halloween costume with a small green leaf accessory. Keep the costume fitted naturally without covering the animal's eyes or changing its species. Place the pet in a cozy autumn photography studio with warm lighting and miniature pumpkins. Create a photorealistic professional pet portrait with realistic fur texture and natural shadows. Keep exactly one animal and the correct number of legs. Avoid extra animals, unnatural paws, duplicated limbs, text and watermarks.
The prompt is pre-filled in the generator. Review it and the credit cost before you start.
A two-person recipe with distinct costumes and positions. State that there are exactly two people.
Prompt recipe
A coordinated couple portrait from one two-person photo.
Use the uploaded photo as the primary reference. The photo contains exactly two people. Preserve both people's recognizable facial identities, facial proportions, skin tones, ages, body proportions and pose. Dress the person on the left in an original western cowboy costume with a dark hat, suede vest and leather belt. Dress the person on the right in an original angel costume with a soft ivory layered outfit, feathered shoulder details and a simple halo. Place the couple on a foggy wooden porch at dusk with warm lantern light and carved pumpkins. Use photorealistic editorial photography, realistic fabric texture and cinematic soft lighting. Keep exactly two people and do not swap their faces. Avoid extra people, extra limbs, duplicated hands, text, logos and watermarks.
The prompt is pre-filled in the generator. Review it and the credit cost before you start.
A short motion beat for a finished costume portrait. A head turn and drifting fog are enough.
Prompt recipe
Upload the finished image first, then paste this motion prompt.
Use the provided image as the exact visual reference and starting composition. Create a continuous short cinematic Halloween portrait animation. Keep the subject's recognizable face, costume, hairstyle and body proportions consistent with the reference. The subject slowly turns their head toward the camera with a subtle mysterious expression. A gentle breeze moves a few loose hair strands and the edge of the clothing. Soft fog drifts through the background. The camera performs a slow smooth push-in. Maintain realistic motion, stable anatomy and consistent lighting. Do not change the person's identity, replace the costume, add characters or introduce sudden scene cuts. No text or watermarks.
The prompt is pre-filled in the generator. Review it and the credit cost before you start.
A text-only atmosphere clip. No face, no identity risk, useful as a background.
Prompt recipe
A liminal hallway with one flickering light and a slow forward move.
Create a short cinematic Halloween atmosphere clip. A long empty corridor with damp carpet, yellowed wallpaper and a single flickering ceiling light. Thin fog stays close to the floor. The camera moves forward slowly and smoothly at eye level with a gentle handheld feel. The light flickers once, then holds. Keep the geometry stable and the perspective consistent. No people, no creatures, no jump scare, no text, no logos and no watermarks.
The prompt is pre-filled in the generator. Review it and the credit cost before you start.
A 3D prompt is different: describe one object, its material and the silhouette. Avoid scenes and multiple characters.
Prompt recipe
Upload a sketch or prop photo. The output is a textured GLB, not a print-ready mesh.
Create a single Halloween figurine from the uploaded reference: a stylized jack-o'-lantern creature with a rounded body, a carved smiling face, a short stem and two small feet. Keep one centered subject with a clear silhouette and no background. Use a matte ceramic material with subtle surface wear, warm orange body color and dark recessed carvings. Preserve the reference shape and proportions. Avoid thin unsupported parts, text, logos and extra objects.
The prompt is pre-filled in the generator. Review it and the credit cost before you start.
If a recipe fails, change the source image before you rewrite the prompt. A sharper face, a cleaner background or a more separated pose fixes more failures than another paragraph of instructions. If the source is good, change one prompt variable: costume, scene or lighting.
Image recipes cost 80 credits per run. Video recipes cost 150 credits for Veo3 Fast or 300 credits for Veo3. A 3D run costs 150, 300 or 500 credits at 512, 1024 or 1536 resolution. The generator shows the cost before submission, and a failed tracked task returns its reserved credits. See pricing for current packs.
Do not test five prompts at once. Pick the recipe closest to your source photo, run it once, and inspect the face, hands and background before changing anything.