The Best Nail File – Glass, Sapphire, Metal or Ceramic?

The question of the best nail file has no single answer – but it does have a clear logic. Two things are decisive: what material the filing surface is made of and what grit it comes with. Everything else is equipment.

The short answer first: for brittle nails the glass file is the gentlest choice, for thick toenails a coarse metal or sapphire file. You will find the right nail file for every nail type in our overview – glass, sapphire, metal, ceramic and emery board.

On the word “test winner”: We do not carry out our own product tests and do not crown a winner – and as far as we know, there has so far been no nail file test by Stiftung Warentest (more on this in the questions at the end). What you get here are the criteria by which a nail file can be measured: material, grit and durability. The table sums them up.

Prices at nagelzange.de, as of September 2026. Free shipping within Germany for orders of €50 or more.

The five types of file compared

• Glass file – the finest removal, it seals the nail edge instead of roughening it. The gentlest version, especially with brittle and soft nails. Washable and practically indestructible.
• Sapphire file – the classic. Usually double-sided with two grits, good for shaping and smoothing in one pass. The all-rounder for normal fingernails.
• Metal file – the highest removal rate, but the coarsest attack on the nail. Its domain is thick, hard toenails, not the manicure.
• Ceramic file – break-resistant and hard-wearing, finer than metal, coarser than glass. A good compromise if one file is to do everything.
• Emery board – abrasive paper on a backing. Inexpensive and pleasantly fine, but a consumable: as soon as the grit fades, it is replaced. In detail: Emery board or glass file?

The short answer for most people: a glass file for the fingernails, a metal or coarse sapphire file for the toenails. That covers practically every situation.

Which grit do you need?

The grit decides how coarsely a file works – the lower the number, the coarser:

• 80 to 100 (coarse) – for shortening thick, hard nails and for preparing artificial and gel nails. Too aggressive on the natural nail.
• 180 (medium) – the all-rounder for shaping normal fingernails and toenails.
• 240 and finer – for smoothing the edge and for sensitive natural nails. Anyone who files daily should stay here.

For daily care the rule is: rather too fine than too coarse. A coarse file is quicker, but leaves a roughened edge that triggers exactly what you want to avoid – tears and splitting.

Which file for which nails?

• Brittle, soft or thin nails – glass file. It seals the nail layers instead of separating them. The single greatest difference with problem nails.
• Normal natural nails – sapphire or glass file with a fine grit.
• Hard, thick toenails – metal file or coarse sapphire file. Here removal rate is what counts.
• Children’s nails – fine glass file. With babies, nails are only filed anyway, not cut.
• Gel and artificial nails – robust metal or mineral file with a coarse grit.

The glass nail file in detail

Of all the types of file, the glass file is the most often sought – and the most often used wrongly. Three points that make the difference:

• The filing surface is etched into the glass, not glued on. It practically does not wear out over years – unlike emery boards.
• It is washable and disinfectable. That is why practices work with it too.
• It is prone to breaking if it lies loose in a bag. Always keep it in its protective sleeve.

Models with a nano coating have a particularly fine surface and additionally polish the edge – for thin nails the gentlest version there is.

Filing properly: the one mistake almost everybody makes

Always file in one direction, never back and forth. Sawing separates the nail layers from each other – it is the real cause of splitting edges, not the file itself. Two further points:

• File on the dry nail. After a bath the nail is soft and frays more easily.
• Lay the file flat against the edge, do not apply it from below – otherwise the nail edge becomes thin.

Further models

• Erbe ceramic file 4-in-1 – four grits on one body, break-resistant.
• Sapphire file, tortoiseshell, 9 cm – compact enough for the case.
• Diamond nail file – a long service life, also for firm nails.
• Emery board, 17 cm – very fine, ideal for sensitive fingernails.

After filing: buff?

A buffing file smooths the nail surface and brings it to a shine without polish. It does not replace the nail file – the file works on the edge, the buffing file on the surface. How often that is harmless and in which order to proceed is set out in Buffing nails: using a buffing file properly.

Care and durability

Rinse glass, sapphire and ceramic files under warm water, disinfect if needed and let them dry. Tap metal files out and store them dry. Emery boards are consumables – replace them as soon as they no longer grip. With normal use, a good glass or sapphire file will accompany you for many years.

Frequently asked questions

Is there a nail file test by Stiftung Warentest?

Not as far as we know (as of September 2026). Stiftung Warentest has not yet published a comparative test of nail files of its own. Anyone searching for “nail file Stiftung Warentest” therefore ends up on comparison portals, not with tested results.

Which nail file is the test winner?

There is no independently determined test winner. What appears as a “test winner” on comparison portals is as a rule based on sales rankings and customer reviews, not on a test of their own. It is more reliable to match the file to your nail type: glass file for brittle nails, sapphire file as the all-rounder, metal file for thick toenails.

Which glass nail file is the best?

One with an etched rather than glued-on filing surface, a fine grit and a protective sleeve. Etched surfaces practically do not wear out; models with a nano coating additionally smooth and polish the edge and are the gentlest choice for thin nails.

Which nail file is the best?

For fingernails the glass file, because it seals the edge instead of roughening it. For thick toenails the metal file or a coarse sapphire file. If you want only one file: a glass file with a fine grit.

Which grit for natural nails?

240 or finer. Anything under 180 removes too much from the natural nail.

Is a glass nail file really better than an emery board?

For brittle nails yes, because the finer surface seals the nail layers. For occasional use a good emery board does the same job – it is simply not as long-lasting. The direct comparison: Emery board or glass file?

Why do my nails split despite filing?

Usually because of the technique, not because of the file: filing back and forth separates the nail layers. Work in one direction and file on the dry nail.

Can nail files be resharpened?

No. Glass, sapphire and ceramic files last a very long time instead; emery boards are replaced.

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More buying guides

• Emery board or glass file? – when each one is worth it
• Buffing nails – using a buffing file properly
• Caring for and cleaning a glass file properly
• Metal nail files: when they are the right choice
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• The best nail nipper – lever action, spring type and blade shape
• The best nail clipper – models compared
• The best toenail scissors – for thick nails and for seniors
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