How to attach chair numbers: clip, glue or screw?
In short: for rental chairs, upholstered chairs and changing layouts, clipping on is the only method without damage. Screws hold but damage the chair. Glue is cheapest and lasts the shortest.

Clipping on
A bent sign that grips the backrest edge.
The sign is bent for the chair model and pushed over the backrest or seat edge. It holds by clamping, can be moved and removed without residue. It needs an accessible edge; on tubular frames a tube clip does the job.
Gluing
Quick, cheap, not permanent.
Stickers or glued signs are fitted in minutes. They hold badly on fabric, leave residue on paint when peeled off, and come loose with cleaning or sunlight. Usable for one-off events, unsuitable for rental chairs.
Screws or rivets
Permanent, but with a hole.
Screwed signs sit firmly and are the classic solution for fixed wooden chairs. They damage the chair permanently, are not allowed on rental chairs and cannot be moved for a new layout.

Upholstered chairs
Only clipping on works.
Nothing glues permanently to fabric or leather, and nobody wants to drill. Clip-on numbers bent for the upholstered edge hold without glue and do not damage the cover.
Comparison
| Clip on | Glue | Screw | |
|---|---|---|---|
| Hold | firm, bent for the model | weakens | firm |
| Damage to the chair | none | residue | hole |
| Movable | yes | no | no |
| Upholstered chairs | yes | poor | no |
| Rental chairs | yes | no | no |
| Tools | no | no | yes |
Checklist
- Photograph the chair: backrest from the front and the side
- Check the edge: wood, plastic, upholstery or tube
- With changing layouts: clip on only
- Test a sample on your own chair
Not sure what fits your chair? Send a photo. Buy chair numbers, request samples.