Let's Enhance vs Upscayl vs MyTools: Which Free Image Upscaler Wins?

The picture is too small. Your mother sent a 900-pixel scan of her parents' wedding photo and asked if you can have it printed at A3, the print shop wants it at 300 DPI, and a plain resize comes out blocky. Or it's a logo someone exported five years ago that has to land on a trade-show banner. Or a 512 × 512 AI artwork the print-on-demand site won't accept. The trick in all three cases is AI upscaling — a model that infers the missing detail rather than just stretching pixels — and three names dominate the search results: Let's Enhance, Upscayl, and MyTools. This is an honest Let's Enhance vs Upscayl vs MyTools comparison, focused on free-tier limits, where your file actually goes, and which option fits the photo on your screen right now.

What an AI Image Upscaler Actually Does

A regular resize stretches existing pixels: edges go blurry, text falls apart, and a 4× output is unmistakably blocky. AI super-resolution uses a model trained on millions of low-res / high-res image pairs to reconstruct what the missing pixels probably look like. It isn't pixel-perfect history — no upscaler can invent detail that wasn't captured — but the output is noticeably sharper, especially on edges, faces, and small text.

The three problems that actually push someone to one of these tools:

• A small source against a big destination. A 600 × 200 logo on a print banner. A scanned photo at 900 px on an A3 frame. A phone-resolution headshot in a website hero.
• AI-generated artwork capped at 512 or 1024 px. Upscaling is the only path to a printable poster from a model that can't render larger natively.
• Old screenshots, scans, or compressed JPEGs that need to look acceptable on a modern 4K display rather than visibly low-res.

The reason people reach for a web tool — instead of an app like Photoshop or Topaz Gigapixel — is the usual mix: a borrowed laptop, a Chromebook, a one-off job not worth a $99 license, or a corporate machine where installing software requires IT.

Let's Enhance: the cloud-based heavyweight

Web-based, paid, and the tool most photographers and e-commerce shops mention first. Let's Enhance runs server-side on GPUs, which lets it ship a wider model selection (default, photo, art, smart-resize, the recent "Ultra" variant) and post-processing options like print presets and DPI control. In side-by-side reviews, it consistently delivers some of the sharpest output in the category, especially on portraits and product photography.

What it gets right

• Strong quality across photo categories. Multiple specialised models, including the Ultra upscaler that does very well on portrait detail, and the only major online tool with built-in DPI/print sizing presets.
• Up to 16× scale. Useful for the rare jobs where 4× isn't enough — blowing a small icon up toward billboard size, or printing from a tiny crop of a larger photo.
• Polished, mature UI. Side-by-side previews, batch processing, and a clear credit-tracking dashboard so the cost of each job is visible upfront rather than after the fact.

Where it falls short

• Account required to do anything. No try-before-you-account: you create an email-verified account just to claim the 10 starting credits.
• Free credits run out fast. 10 credits at signup, with the cost per image varying by output resolution and which enhancements you turn on. Free outputs are also capped at around 8 megapixels and can carry a watermark depending on plan.
• Files are uploaded to Let's Enhance servers. Auto-deleted on a schedule, but the photo passes through someone else's infrastructure — a real consideration for personal scans, medical images, or unreleased work.

Upscayl: the free, open-source desktop app

Open-source on GitHub, free for personal use, and the answer most enthusiasts give when someone asks for a free upscaler. It bundles Real-ESRGAN models and runs them locally on your GPU using Vulkan, CUDA, or OpenCL. Because everything happens on your machine, there are no per-image limits, no watermark, no signup, and no upload.

What it gets right

• Genuinely free with no caps. No credits, no daily limit, no watermark, no Pro tier locking the useful models behind a paywall.
• 100% local processing. Photos never leave your machine. For sensitive scans, family photos, or unreleased work, that's the strongest privacy posture in the category.
• Multiple models. Several Real-ESRGAN variants tuned for photos, anime, line art, and digital paintings, plus the option to chain a 2× pass over a 2× pass when you need a bigger output than a single run gives you.

Where it falls short

• Desktop-only and needs install. Windows, macOS, or Linux executable — no help on a Chromebook, on iPad, or on a managed work laptop without admin rights.
• GPU strongly recommended. It runs without one, but performance falls off a cliff. Older laptops with integrated graphics are the painful middle ground between "fast enough" and "give up and use the web".
• More setup than a one-button web tool. Choosing the right model for the kind of image, deciding when to enable face enhancement, and managing output paths and naming is real friction if you only upscale occasionally.

MyTools: browser-only, truly free

MyTools takes a third route. A small AI super-resolution model loads into your browser the first time you open the page, then runs on your CPU, on your device, against the file you dropped on the page. No upload, no install, no account, and no per-image cost.

What it gets right

• The image never leaves your tab. Decoded, upscaled, and re-encoded inside the browser. Nothing to auto-delete on a schedule, because nothing was uploaded to begin with.
• Free with no daily cap and no watermark. Run it ten times in a morning on different photos — same experience, no countdown.
• Zero install, zero signup. Open the page, drag in up to five images, pick 2× or 4×, download. The whole flow works on a Chromebook, on a borrowed laptop, on an iPad — anywhere with a modern browser.

Where it falls short

• CPU-only, so it's slower than cloud tools. Roughly 5–10 seconds per image at 2× and 15–30 seconds at 4× on a modern laptop. Phones work but suffer noticeably; for a batch, a desktop browser is far more comfortable.
• 2× and 4× only — no in-between, no higher. No 1.5×, no 8×, no 16×. The two-preset path keeps the UI simple but rules out the niche jobs Let's Enhance handles.
• Single model, no specialised modes. No "portrait" or "anime" variant, no face-enhancement toggle. For everyday photos this is fine; for the demanding cases — heavily compressed faces, tiny printed text — both Let's Enhance and Upscayl give you more controls.
• Hard input limits. Up to 5 images per batch, 25 MB and 4,000 px on the long edge per file. Beyond that, browser memory becomes the bottleneck.

At a Glance

	Let's Enhance	Upscayl	MyTools
Price	Credit-based, paid past 10 free	Free (open source)	Free, no caps
Signup required	Yes	No	No
Install required	No (web)	Yes (desktop app)	No (web)
Files uploaded to a server	Yes	No	No
Max scale	Up to 16×	4× per pass, stackable	2× or 4×
Best for	Print-grade output	Power users with a GPU	Quick, private one-offs

Which one should you pick?

If you're producing print-resolution output from a small source and quality is the only thing that matters — wedding photos heading to A3, product shots for a catalogue, a portrait for a 4×6 enlargement — Let's Enhance is the right call. The newest cloud models are genuinely sharper than anything that runs in a browser today, and the print presets save real time on the back end. The credit cost is the trade-off, not a hidden gotcha.

If you have a GPU, you don't mind installing software, and you upscale often enough that any per-image cost would add up — Upscayl. It's the strongest free option and stays free no matter how many images you push through it. The catch is the install and the GPU; if either is out of reach, Upscayl quietly stops being an option.

If you're doing this once or twice on whatever device is in front of you, on a file you'd rather not hand over to a server, and you're fine with 2× or 4× and a couple of extra seconds per image — MyTools. No account, no install, no upload, and no surprise paywall on the third photo.

The Bottom Line

There's no single winner — each tool's trade-offs are real, and the right pick is the one that matches the job in front of you. Print-grade portraits with credits to spend? Let's Enhance. A GPU and a long queue of photos to push through? Upscayl. A one-off enlargement on a borrowed Chromebook, no signup, on a file that should stay yours? MyTools.

If that last description fits, open the MyTools image upscaler in your browser → — drag in up to five images, pick 2× or 4×, and the upscaled files land in your downloads folder without anything leaving your tab.