Send a file

100% free — no registration required

Upscale imageslocally

Photo upscale: enlarge your images locally (AVIF, JPG, PNG, WebP), in batch, without cloud or AI.

With a FileVert plan

  • Transfers available longer
  • Your full history
  • Password and encryption on your transfers
  • Saving and sharing your LocalFlow sequences

100% Client-side

Local processing

0 Storage

No data stored

Confidential

Protects your data

Free

No limits

What changes everything

Upscale your images before sending. In bulk, no AI, in your browser.

The challenge

Small image, risky AI upscale

Online services upload your visuals to their servers and may invent details not present in the original.

800 × 600 px

IA cloudupload ✗
Batch

Whole folder, structure preserved

Up to 50 images per session: import a full folder, get the same tree back, ready to transfer.

shoot/
raw/
img-01.jpg
img-02.jpg
export/
hero.png
×50
Resolution

×2, ×4 or target width in pixels

Pick an upscale factor or exact width. Up to 40 megapixels output, aspect ratio preserved.

×2×43200 px

Avant

1200 px

Après

4800 px

No AI

Pro interpolation, reproducible output

Deterministic Photon algorithms (WASM): no proprietary model, no hallucinated textures or faces.

Interpolation pro

sans IA, reproductible

déterministepas d'hallucination
Formats

JPG, PNG, WebP, AVIF and EXIF stripped

All modern formats in and out. Metadata (GPS, author, camera) removed on export.

JPGPNGWebPAVIF
GPSAuteurAppareil
EXIF purgé
Explore flow

Upscale here, show next

Files stay on your machine until you send. Transfer in Explore mode: recipient browses the gallery, no forced download.

Ready on your device

Image gallery in Explore mode

Browse before downloading

Transfer these files →

Continue: compress →

Understand

Local image upscaler, without AI dependency

The FileVert enlargement tool allows you to increase the resolution of your images (JPG, PNG, WebP, AVIF) directly in your browser. Unlike online AI-based upscalers, no files are sent to a server and no external model analyzes your visuals. Resizing is performed locally, with deterministic, predictable and documented algorithms.

  • No files are sent to a server
  • No remote storage
  • No external access to your data
  • Works even offline

Why upscale without online AI?

  • AI upscalers upload your photos to their servers before processing
  • AI may invent details (textures, faces) not in the original
  • Professional or confidential visuals should not pass through a third-party cloud
  • AI output varies run to run: hard to reproduce in a serious workflow
  • Local interpolation is deterministic, documented and model-free
After the tool

Send the result: standard mode or Explore mode

When your file is ready on your device, send it with FileVert Transfer from the built-in send action. Choose whether the recipient downloads immediately (standard) or previews first in the browser without a silent local copy (Explore mode).

Standard mode

Secure link: the recipient downloads the file in the usual way. Best for final deliverables, archives and heavy attachments.

Guide: send very large files

Explore mode

Share images to flip through in a grid or fullscreen before any download decision.

Guide: photo gallery in the browser
PRIVACY

Privacy & sobriety

Your images never leave your computer

100% local processing in your browser

No data sent to our servers

Responsible alternative to AI-based upscale services

0 Data stored

All processing is done locally in your browser.

Our other tools from FileVert Studio

Prepare your files with our other free, local tools.

Video converter / compressor

Convert MP4, WebM, MOV, MKV, quality profiles, target size and batch locally.

Use

Subtitle generator

Local transcription, MP4 or MKV export, SRT download.

Use

Audio converter

Convert and compress audio files locally (MP3, M4A, WAV, AIFF, FLAC, OGG), in batch, with no server.

Use

Image Compressor

Reduce the weight of your images without visible quality loss.

Use

Crop and references

Same ratio across the batch, reference images and thumbnail board for image to video.

Use

Vectorize an image, a logo

Vectorize JPEG, PNG, WebP, AVIF, GIF, BMP and SVG to SVG locally, with editable layers and pro exports.

Use

Image converter

Convert to JPG, PNG, WebP or AVIF, in batch, locally in your browser.

Use

Compress PDF

Compress and optimize your PDF documents instantly.

Use

Redact and anonymize PDF and photos

Face blur, PII redaction, EXIF and PDF metadata strip. 100% local — work on a copy, keep the original.

Use
See FileVert solutions
What’s next?

Everything you can do with FileVert

Prepare locally, send up to 200 GB, let recipients preview without downloading, collaborate and measure your impact. Discover every use case.

See all use cases

Frequently asked questions

Everything you need to know about FileVert Image Upscaler

Where are my images processed during upscaling?

All operations run locally in your browser. No file is sent to a server.

Does the tool use artificial intelligence?

No. Upscaling uses deterministic interpolation algorithms (Photon WASM), with no AI models or machine learning.

Can I upscale images in batch or by folder?

Yes. Up to 50 images per session, whole folders with tree preserved. ZIP or direct transfer to FileVert.

Which formats are supported?

JPEG, PNG, WebP and AVIF, in and out. EXIF metadata is stripped on export.

What is the maximum upscale factor?

Up to ×4 or a target width in pixels, with a 40 megapixel output cap.

Why not use an online AI upscaler?

AI services upload your visuals and may invent details. FileVert upscales locally, no cloud, reproducible output.

Can I use the tool offline?

Yes. Once the page is loaded, upscaling works without a network.

Do I need an account?

No. The tool is free and available immediately, no sign-up required.

Free image enlargement and resolution improvement tool, 100% local in browser, no registration, no AI, to prepare your files before sending, web publishing or archiving.