How to buy art online: authenticity, pricing, and security

Buying art online is much easier today than it was a few years ago. Galleries, auction houses, antique dealers, specialist platforms and professional sellers offer access to works of widely differing origins, periods and prices without leaving home. This breadth of choice is a clear advantage, but it also calls for judgement. An attractive photograph, a familiar signature or an enthusiastic description may spark interest without providing enough information to assess what is in front of us.

Buying well does not mean turning every acquisition into an academic investigation. It means knowing which questions are worth checking before paying, what information really matters and which signs should be interpreted cautiously. In the art market, particularly the secondary market, missing documentation is not unusual. Neither are old restorations, changes of frame, qualified attributions or works that have passed through several hands before reaching the current seller. Rather than seeking absolute certainty, it is worth learning to assess the evidence as a whole.

What to check before buying a painting online

The choice begins with a simple question: what exactly are you acquiring? It is important to distinguish an original painting from a print, a signed edition from a reproduction, and documented authorship from an attribution that remains open. Only then does comparing prices make sense, because pieces showing the same image may belong to very different market categories.

Look at plenty of art before buying

One of the best ways to develop judgement is to look at many works before starting to buy regularly. Auction houses, galleries, sales archives, fairs and catalogues allow you to compare artists, techniques, sizes, quality and prices. Over time, differences that initially escape notice become clearer: particular periods in an artist's career, more sought-after subjects, uneven quality within a body of work, or substantial differences between an asking price and the price actually achieved when a work sells.

This last point is especially important. It is common to see a painting advertised for several thousand euros and assume that any work by the same artist automatically has a similar value. Asking prices, however, do not necessarily reflect market prices. When assessing a purchase, look for completed sales and, where possible, works comparable in technique, size, period, subject and quality. A small drawing and a large oil painting by the same artist belong to different markets, even if both bear the same signature.

It is also worth allowing yourself some time. Many impulse purchases begin with the feeling that an opportunity will never arise again. Sometimes that is true, but a little research often reveals other similar, or even better, works on the market. The reverse also happens: an apparently modest work may become more interesting as we learn about the artist, its context or the period to which it belongs.

The absence of a certificate does not invalidate a work

A common mistake when starting to buy art is to give a certificate of authenticity more weight than it necessarily deserves. Much of the secondary market has no certificates at all, and that is normal. Many nineteenth-century works, a substantial proportion of twentieth-century Spanish painting and numerous pieces from private collections never had a modern certificate. Others may originally have been sold with an invoice or documentation lost decades later.

The appropriate question is therefore not simply “Does it have a certificate?” but “What evidence supports this attribution?” For a living contemporary artist represented by a gallery or with an organised archive, a certificate issued by the artist, their studio or a recognised body can be highly relevant. For an older work, assessment often rests on other factors: quality, technique, materials, signature, style, known provenance, old labels, bibliography, auction history and consistency with the artist's known work.

Not all certificates carry the same weight. A document issued by the seller stating that a work is authentic is not equivalent to certification by the artist, a foundation, an expert committee or a body with recognised authority on that artist. The value of a document depends above all on who stands behind it.

Among the Taller's works is Manel Pujol Baladas's Retrato de mujer “Siempre tan lejos” (1993). The piece retains a signature, date and inscription on the reverse and is accompanied by authenticity documentation. These elements are studied alongside its technique and the painter's career: what matters is both the existence of the document and what it actually establishes.

A signature is a clue, not a guarantee

A signature can be very important, but should never be assessed in isolation. Check whether it is consistent with other known signatures by the artist, appears in a usual position, seems integrated into the painting and fits chronologically with the work's period. Some artists changed their signature during their careers; others signed differently depending on the medium.

Likewise, an unsigned work is not necessarily without value. Older painting includes many anonymous works, workshop pieces and works associated with a school, as well as legitimate pieces by known artists that were never signed. The key is to distinguish clearly between a signed work, an attributed work, a workshop piece, a work of a school and one made “in the manner of” another artist. These distinctions are not merely terminology: they determine the degree of certainty and, often, the price.

When attribution accounts for a substantial part of the financial value, more information is needed. A seller presenting a work as autograph—that is, by the artist's own hand—should be able to explain why. If it is offered instead as “nineteenth-century Spanish school” or “circle of”, uncertainty forms part of the description and should also be reflected in the price.

Escena de mercado rural bávaro, a late nineteenth-century oil painting catalogued under the name Karl Stuhlmüller, bears the inscription “K. Stuhlmüller München”. Its reading should be considered alongside the subject, composition and pictorial language. This is a more rigorous way to examine a signature than simply looking for a familiar name.

The reverse can tell us more than we expect

When buying paintings online, one of the most useful photographs is often the one receiving the least attention: the reverse. It may show old gallery labels, auction-house stamps, inventory numbers, notes, inscriptions, canvas manufacturers' marks or traces of previous exhibitions. Sometimes a partially preserved label can help reconstruct part of a work's history.

The reverse also provides material information. The stretcher, nails, wedges, canvas or particular trade marks may be compatible or incompatible with a proposed date. This does not mean that a work can be dated with absolute precision from its back alone, but some inconsistencies may justify further questions.

Later interventions should also be considered. An old painting may have been relined, placed on a new stretcher or restored several times. None of these necessarily indicates a problem, but they are worth knowing about. For significant works, condition and the type of restoration undertaken can have a considerable effect on value.

On the reverse of Escena de mercado rural bávaro, catalogued under the name Karl Stuhlmüller, the canvas weave, wooden stretcher components and two vertical crossbars are visible. The photograph shows the painting's material construction and visible condition from behind. These features are useful for examination, although on their own they neither establish authorship nor determine an exact date.

Ask for photographs that allow a proper examination

Images on a sales page should do more than present a work attractively. Where possible, obtain a good-quality frontal photograph, signature details, close-ups of possible losses, views of the reverse and photographs taken with light from the side.

Raking or side lighting is particularly useful for paintings because it helps reveal craquelure, lifting paint, distortions, overpainting and surface irregularities that may escape notice under frontal lighting. It also helps us understand the texture and handling of the paint.

Overly retouched photographs call for some caution. Contrast, saturation and colour temperature can significantly change a work's appearance. Where colour is important to the purchase, it is reasonable to request additional images taken in natural light or under different conditions.

A clear condition description is also a positive sign. A seller who notes a small loss, craquelure, visible restoration or damage to the frame generally inspires more confidence than a description composed solely of adjectives such as “magnificent”, “extraordinary” or “exceptional”.

Montse Valdés's Figura femenina, an oil on panel from around 1995, allows comparison between an overall view and details of the surface and signature. A good general photograph shows the composition; close-ups reveal the brushwork and material characteristics more clearly. This documentation is especially valuable when buying original paintings online, although it does not replace a physical inspection when one is necessary.

Not every restoration is a problem

Older works have a material history. They have been cleaned, varnished, transported, framed and, in some cases, restored. Expecting a two-hundred-year-old painting to remain exactly as it left the studio is unrealistic.

What matters is distinguishing reasonable intervention from excessive restoration. Professional cleaning, consolidation of unstable areas or an old relining can be entirely acceptable. Extensive overpainting, overly aggressive cleaning or substantial reconstruction, however, can adversely affect both quality and value.

Price matters here too. An apparently inexpensive work may cease to be so if it needs complex restoration. For modestly valued pieces, professional treatment can cost more than the work itself. For more significant works, a well-executed restoration may be fully justified. Buyers should always consider both together.

The frame can change our perception too

A spectacular frame can completely change the impression a painting makes. A mediocre work often appears more important inside a large gilded, carved or antique-looking frame. A simple exercise is therefore useful: imagine the painting without it.

Would it still interest us as much? Does the frame actually belong to the painting's period? Does it have value in its own right, or is it a later, purely decorative addition? These questions help separate two objects that, although presented together, do not always have the same importance.

Sometimes the opposite applies: certain antique frames have substantial independent value and may be even more interesting than the paintings they contain. Again, avoid valuing the whole automatically.

Take particular care with prints

Engravings, lithographs, screenprints and other works on paper require specific attention because there is considerable confusion between original prints and reproductions. An image reproducing a known artist's composition does not mean that the object is an original work by that artist.

Check the precise technique, edition size, numbering, publisher, paper and type of signature. A handwritten signature, a printed signature and a signature incorporated into the printing plate are different things. Similarly, numbering written in pencil does not by itself guarantee an edition's authenticity.

For major artists, correctly identifying an edition can make an enormous financial difference. Original editions, later editions, posthumous impressions, facsimiles and decorative reproductions may look similar at first glance. Technical and publishing information is therefore particularly important for prints.

Modest Cuixart's lithograph Rostro femenino en azul is signed and dated 1981 in pencil and numbered 34/300. It is an editioned print, not a unique painting; nor should it be confused with a decorative reproduction. To assess such an example, look for references to the same edition, check the paper's condition and distinguish the handwritten signature from a printed one.

It is also important to distinguish an advertised price from an auction hammer price. If a work sells for €600 at auction, that figure is not necessarily what the buyer pays: commissions, taxes and transport may be added. For the same reason, a gallery price that includes documentation, professional assistance and sales services is not directly comparable with a hammer price. These are different references that should be understood before deciding.

Check dimensions and the full cost

The internet largely removes our sense of scale. A twenty-centimetre work can look monumental on screen, while a large painting may seem manageable until it arrives. Before buying, check the exact dimensions and distinguish the artwork's size from the overall framed size.

A very simple method is to mark out the approximate dimensions on the wall where you plan to hang it. This helps avoid common mistakes and gives a better understanding of the piece's actual presence.

The total cost must also be calculated. Commissions, taxes, transport, insurance, import charges, restoration and framing can all add to the artwork's price. At auction, distinguishing the hammer price from the final price is essential. An apparently good purchase may cease to be one once all associated costs are included.

It is therefore worth setting a maximum price before bidding. Auctions have a clear psychological element: when someone exceeds our bid by a small amount, it is easy to justify another bid, and then another. A series of small increases can take us far beyond the original limit.

How an artwork is packed and shipped

Transport is part of the purchase. Before paying, find out how the corners, frame and surface are protected, what packaging is used and who handles dispatch. A painting on canvas and a work on paper behind glass face different risks. If transport cover is arranged, check its maximum amount and exclusions, as policies do not all cover damage in the same way.

It is also worth knowing the carrier, available tracking, the procedure for reporting damage and the return conditions. International purchases may involve taxes, customs procedures or specific restrictions. A professional gallery, a private sale and an auction do not necessarily operate under the same conditions.

Assess the seller as well as the artwork

Trust in the seller is part of the purchase. It matters who is behind the piece, what experience they have, what information they provide and how they answer questions. A serious seller should be able to explain both what they know about a work and what they do not.

Transparency is especially important when provenance is incomplete. Saying that a painting's earlier history is unknown is entirely legitimate; inventing an attractive story to fill the gap is not. Some uncertainties in the art market simply cannot be resolved, and a good professional should know how to express them.

Always retain purchase information: the invoice, photographs, artwork description, relevant messages and any available documentation. It may seem minor at the time, but over the years these records can become part of the piece's provenance.

Do not confuse age with value

An old work is not necessarily valuable. There are eighteenth-century paintings of limited quality and contemporary works with much stronger markets. Age is only one factor in valuation.

Authorship, quality, rarity, condition, size, subject, provenance and demand matter much more than an early date alone. This is particularly clear in religious painting, anonymous portraits and decorative works, where a considerable difference may exist between a good school piece and routine production.

The useful question is not “How old is it?” but “How good is it within its category?” This change of perspective prevents many purchases made solely for the appeal of age.

A contemporary work such as José Luis Serzo's La construcción de un dios de los vientos shows how inadequate age alone is as a criterion. Its seascape, the fantastical element crossing it and the inscriptions associated with the series “Absurdas Aproximaciones” form part of a distinctive pictorial proposal. When comparing artists and periods, study the quality and context of each work rather than ranking them by age.

Buying art also means learning

Judgement does not develop immediately. It grows through looking, comparing, visiting exhibitions, reviewing auction results, talking with sellers and sometimes making small mistakes. Taste also changes over time, a natural part of any collection.

Beyond price or possible appreciation, ask whether you really want to live with the work. Buying art exclusively as an investment can be risky, because no market guarantees future performance. A work chosen thoughtfully, bought well and acquired at a reasonable price can continue to make sense even if its value never rises.

Before deciding, ask some basic questions: Do I know exactly what I am buying? Is the attribution sufficiently supported? Have I found comparable market references? Do I know the work's actual condition? Have I seen enough photographs? Do I know the final cost, including all expenses? Do I trust the seller?

Perhaps the most important question is also the simplest: if I learned tomorrow that this work would never be worth more than I paid, would I still want it?

If the answer is yes, the purchase probably makes considerably more sense.

You can download the Taller's free guide to buying art online (PDF in Spanish). It covers authorship, technique, condition, documentation, price, photographs, shipping and terms, with practical worksheets for reviewing and comparing works. No subscription is required to download it.

Buying art thoughtfully is not about memorising a few rules. Above all, it means learning to look.

To explore the history and techniques of works in our catalogue further, read the articles on Ricard Opisso and Manel Pujol Baladas.